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diff --git a/network/squid/squid.conf.documented b/network/squid/squid.conf.documented new file mode 100644 index 0000000000000..4dc84c53cc93e --- /dev/null +++ b/network/squid/squid.conf.documented @@ -0,0 +1,5754 @@ +# WELCOME TO SQUID 3.1.12 +# ---------------------------- +# +# This is the default Squid configuration file. You may wish +# to look at the Squid home page (http://www.squid-cache.org/) +# for the FAQ and other documentation. +# +# The default Squid config file shows what the defaults for +# various options happen to be. If you don't need to change the +# default, you shouldn't uncomment the line. Doing so may cause +# run-time problems. In some cases "none" refers to no default +# setting at all, while in other cases it refers to a valid +# option - the comments for that keyword indicate if this is the +# case. +# + +# Configuration options can be included using the "include" directive. +# Include takes a list of files to include. Quoting and wildcards is +# supported. +# +# For example, +# +# include /path/to/included/file/squid.acl.config +# +# Includes can be nested up to a hard-coded depth of 16 levels. +# This arbitrary restriction is to prevent recursive include references +# from causing Squid entering an infinite loop whilst trying to load +# configuration files. + +# TAG: dns_testnames +# Remove this line. DNS is no longer tested on startup. +#Default: +# none + +# TAG: extension_methods +# Remove this line. All valid methods for HTTP are accepted by default. +#Default: +# none + +# TAG: incoming_rate +# TAG: server_http11 +# Remove this line. HTTP/1.1 is supported by default. +#Default: +# none + +# TAG: upgrade_http0.9 +# Remove this line. ICY/1.0 streaming protocol is supported by default. +#Default: +# none + +# TAG: zph_local +# Alter these entries. Use the qos_flows directive instead. +#Default: +# none + +# TAG: header_access +# Since squid-3.0 replace with request_header_access or reply_header_access +# depending on whether you wish to match client requests or server replies. +#Default: +# none + +# TAG: httpd_accel_no_pmtu_disc +# Since squid-3.0 use the 'disable-pmtu-discovery' flag on http_port instead. +#Default: +# none + +# OPTIONS FOR AUTHENTICATION +# ----------------------------------------------------------------------------- + +# TAG: auth_param +# This is used to define parameters for the various authentication +# schemes supported by Squid. +# +# format: auth_param scheme parameter [setting] +# +# The order in which authentication schemes are presented to the client is +# dependent on the order the scheme first appears in config file. IE +# has a bug (it's not RFC 2617 compliant) in that it will use the basic +# scheme if basic is the first entry presented, even if more secure +# schemes are presented. For now use the order in the recommended +# settings section below. If other browsers have difficulties (don't +# recognize the schemes offered even if you are using basic) either +# put basic first, or disable the other schemes (by commenting out their +# program entry). +# +# Once an authentication scheme is fully configured, it can only be +# shutdown by shutting squid down and restarting. Changes can be made on +# the fly and activated with a reconfigure. I.E. You can change to a +# different helper, but not unconfigure the helper completely. +# +# Please note that while this directive defines how Squid processes +# authentication it does not automatically activate authentication. +# To use authentication you must in addition make use of ACLs based +# on login name in http_access (proxy_auth, proxy_auth_regex or +# external with %LOGIN used in the format tag). The browser will be +# challenged for authentication on the first such acl encountered +# in http_access processing and will also be re-challenged for new +# login credentials if the request is being denied by a proxy_auth +# type acl. +# +# WARNING: authentication can't be used in a transparently intercepting +# proxy as the client then thinks it is talking to an origin server and +# not the proxy. This is a limitation of bending the TCP/IP protocol to +# transparently intercepting port 80, not a limitation in Squid. +# Ports flagged 'transparent', 'intercept', or 'tproxy' have +# authentication disabled. +# +# === Parameters for the basic scheme follow. === +# +# "program" cmdline +# Specify the command for the external authenticator. Such a program +# reads a line containing "username password" and replies "OK" or +# "ERR" in an endless loop. "ERR" responses may optionally be followed +# by a error description available as %m in the returned error page. +# If you use an authenticator, make sure you have 1 acl of type +# proxy_auth. +# +# By default, the basic authentication scheme is not used unless a +# program is specified. +# +# If you want to use the traditional NCSA proxy authentication, set +# this line to something like +# +# auth_param basic program /usr/libexec/ncsa_auth /usr/etc/passwd +# +# "utf8" on|off +# HTTP uses iso-latin-1 as characterset, while some authentication +# backends such as LDAP expects UTF-8. If this is set to on Squid will +# translate the HTTP iso-latin-1 charset to UTF-8 before sending the +# username & password to the helper. +# +# "children" numberofchildren +# The number of authenticator processes to spawn. If you start too few +# Squid will have to wait for them to process a backlog of credential +# verifications, slowing it down. When password verifications are +# done via a (slow) network you are likely to need lots of +# authenticator processes. +# auth_param basic children 5 +# +# "concurrency" concurrency +# The number of concurrent requests the helper can process. +# The default of 0 is used for helpers who only supports +# one request at a time. Setting this changes the protocol used to +# include a channel number first on the request/response line, allowing +# multiple requests to be sent to the same helper in parallell without +# wating for the response. +# Must not be set unless it's known the helper supports this. +# auth_param basic concurrency 0 +# +# "realm" realmstring +# Specifies the realm name which is to be reported to the +# client for the basic proxy authentication scheme (part of +# the text the user will see when prompted their username and +# password). There is no default. +# auth_param basic realm Squid proxy-caching web server +# +# "credentialsttl" timetolive +# Specifies how long squid assumes an externally validated +# username:password pair is valid for - in other words how +# often the helper program is called for that user. Set this +# low to force revalidation with short lived passwords. Note +# setting this high does not impact your susceptibility +# to replay attacks unless you are using an one-time password +# system (such as SecureID). If you are using such a system, +# you will be vulnerable to replay attacks unless you also +# use the max_user_ip ACL in an http_access rule. +# +# "casesensitive" on|off +# Specifies if usernames are case sensitive. Most user databases are +# case insensitive allowing the same username to be spelled using both +# lower and upper case letters, but some are case sensitive. This +# makes a big difference for user_max_ip ACL processing and similar. +# auth_param basic casesensitive off +# +# === Parameters for the digest scheme follow === +# +# "program" cmdline +# Specify the command for the external authenticator. Such +# a program reads a line containing "username":"realm" and +# replies with the appropriate H(A1) value hex encoded or +# ERR if the user (or his H(A1) hash) does not exists. +# See rfc 2616 for the definition of H(A1). +# "ERR" responses may optionally be followed by a error description +# available as %m in the returned error page. +# +# By default, the digest authentication scheme is not used unless a +# program is specified. +# +# If you want to use a digest authenticator, set this line to +# something like +# +# auth_param digest program /usr/bin/digest_pw_auth /usr/etc/digpass +# +# "utf8" on|off +# HTTP uses iso-latin-1 as characterset, while some authentication +# backends such as LDAP expects UTF-8. If this is set to on Squid will +# translate the HTTP iso-latin-1 charset to UTF-8 before sending the +# username & password to the helper. +# +# "children" numberofchildren +# The number of authenticator processes to spawn (no default). +# If you start too few Squid will have to wait for them to +# process a backlog of H(A1) calculations, slowing it down. +# When the H(A1) calculations are done via a (slow) network +# you are likely to need lots of authenticator processes. +# auth_param digest children 5 +# +# "realm" realmstring +# Specifies the realm name which is to be reported to the +# client for the digest proxy authentication scheme (part of +# the text the user will see when prompted their username and +# password). There is no default. +# auth_param digest realm Squid proxy-caching web server +# +# "nonce_garbage_interval" timeinterval +# Specifies the interval that nonces that have been issued +# to client_agent's are checked for validity. +# +# "nonce_max_duration" timeinterval +# Specifies the maximum length of time a given nonce will be +# valid for. +# +# "nonce_max_count" number +# Specifies the maximum number of times a given nonce can be +# used. +# +# "nonce_strictness" on|off +# Determines if squid requires strict increment-by-1 behavior +# for nonce counts, or just incrementing (off - for use when +# useragents generate nonce counts that occasionally miss 1 +# (ie, 1,2,4,6)). Default off. +# +# "check_nonce_count" on|off +# This directive if set to off can disable the nonce count check +# completely to work around buggy digest qop implementations in +# certain mainstream browser versions. Default on to check the +# nonce count to protect from authentication replay attacks. +# +# "post_workaround" on|off +# This is a workaround to certain buggy browsers who sends +# an incorrect request digest in POST requests when reusing +# the same nonce as acquired earlier on a GET request. +# +# === NTLM scheme options follow === +# +# "program" cmdline +# Specify the command for the external NTLM authenticator. +# Such a program reads exchanged NTLMSSP packets with +# the browser via Squid until authentication is completed. +# If you use an NTLM authenticator, make sure you have 1 acl +# of type proxy_auth. By default, the NTLM authenticator_program +# is not used. +# +# auth_param ntlm program /usr/bin/ntlm_auth +# +# "children" numberofchildren +# The number of authenticator processes to spawn (no default). +# If you start too few Squid will have to wait for them to +# process a backlog of credential verifications, slowing it +# down. When credential verifications are done via a (slow) +# network you are likely to need lots of authenticator +# processes. +# +# auth_param ntlm children 5 +# +# "keep_alive" on|off +# Whether to keep the connection open after the initial response where +# Squid tells the browser which schemes are supported by the proxy. +# Some browsers are known to present many login popups or to corrupt +# POST/PUT requests transfer if the connection is not closed. +# The default is currently OFF to avoid this, but may change. +# +# auth_param ntlm keep_alive on +# +# === Options for configuring the NEGOTIATE auth-scheme follow === +# +# "program" cmdline +# Specify the command for the external Negotiate authenticator. +# This protocol is used in Microsoft Active-Directory enabled setups with +# the Microsoft Internet Explorer or Mozilla Firefox browsers. +# Its main purpose is to exchange credentials with the Squid proxy +# using the Kerberos mechanisms. +# If you use a Negotiate authenticator, make sure you have at least +# one acl of type proxy_auth active. By default, the negotiate +# authenticator_program is not used. +# The only supported program for this role is the ntlm_auth +# program distributed as part of Samba, version 4 or later. +# +# auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=gss-spnego +# +# "children" numberofchildren +# The number of authenticator processes to spawn (no default). +# If you start too few Squid will have to wait for them to +# process a backlog of credential verifications, slowing it +# down. When crendential verifications are done via a (slow) +# network you are likely to need lots of authenticator +# processes. +# auth_param negotiate children 5 +# +# "keep_alive" on|off +# Whether to keep the connection open after the initial response where +# Squid tells the browser which schemes are supported by the proxy. +# Some browsers are known to present many login popups or to corrupt +# POST/PUT requests transfer if the connection is not closed. +# The default is currently OFF to avoid this, but may change. +# +# auth_param negotiate keep_alive on +# +# +# Examples: +# +##Recommended minimum configuration per scheme: +##auth_param negotiate program <uncomment and complete this line to activate> +##auth_param negotiate children 5 +##auth_param negotiate keep_alive on +## +##auth_param ntlm program <uncomment and complete this line to activate> +##auth_param ntlm children 5 +##auth_param ntlm keep_alive on +## +##auth_param digest program <uncomment and complete this line> +##auth_param digest children 5 +##auth_param digest realm Squid proxy-caching web server +##auth_param digest nonce_garbage_interval 5 minutes +##auth_param digest nonce_max_duration 30 minutes +##auth_param digest nonce_max_count 50 +## +##auth_param basic program <uncomment and complete this line> +##auth_param basic children 5 +##auth_param basic realm Squid proxy-caching web server +##auth_param basic credentialsttl 2 hours +#Default: +# none + +# TAG: authenticate_cache_garbage_interval +# The time period between garbage collection across the username cache. +# This is a tradeoff between memory utilization (long intervals - say +# 2 days) and CPU (short intervals - say 1 minute). Only change if you +# have good reason to. +#Default: +# authenticate_cache_garbage_interval 1 hour + +# TAG: authenticate_ttl +# The time a user & their credentials stay in the logged in +# user cache since their last request. When the garbage +# interval passes, all user credentials that have passed their +# TTL are removed from memory. +#Default: +# authenticate_ttl 1 hour + +# TAG: authenticate_ip_ttl +# If you use proxy authentication and the 'max_user_ip' ACL, +# this directive controls how long Squid remembers the IP +# addresses associated with each user. Use a small value +# (e.g., 60 seconds) if your users might change addresses +# quickly, as is the case with dialups. You might be safe +# using a larger value (e.g., 2 hours) in a corporate LAN +# environment with relatively static address assignments. +#Default: +# authenticate_ip_ttl 0 seconds + +# ACCESS CONTROLS +# ----------------------------------------------------------------------------- + +# TAG: external_acl_type +# This option defines external acl classes using a helper program +# to look up the status +# +# external_acl_type name [options] FORMAT.. /path/to/helper [helper arguments..] +# +# Options: +# +# ttl=n TTL in seconds for cached results (defaults to 3600 +# for 1 hour) +# negative_ttl=n +# TTL for cached negative lookups (default same +# as ttl) +# children=n Number of acl helper processes spawn to service +# external acl lookups of this type. (default 5) +# concurrency=n concurrency level per process. Only used with helpers +# capable of processing more than one query at a time. +# cache=n result cache size, 0 is unbounded (default) +# grace=n Percentage remaining of TTL where a refresh of a +# cached entry should be initiated without needing to +# wait for a new reply. (default 0 for no grace period) +# protocol=2.5 Compatibility mode for Squid-2.5 external acl helpers +# ipv4 / ipv6 IP-mode used to communicate to this helper. +# For compatability with older configurations and helpers +# the default is currently 'ipv4'. +# +# FORMAT specifications +# +# %LOGIN Authenticated user login name +# %EXT_USER Username from external acl +# %IDENT Ident user name +# %SRC Client IP +# %SRCPORT Client source port +# %URI Requested URI +# %DST Requested host +# %PROTO Requested protocol +# %PORT Requested port +# %PATH Requested URL path +# %METHOD Request method +# %MYADDR Squid interface address +# %MYPORT Squid http_port number +# %PATH Requested URL-path (including query-string if any) +# %USER_CERT SSL User certificate in PEM format +# %USER_CERTCHAIN SSL User certificate chain in PEM format +# %USER_CERT_xx SSL User certificate subject attribute xx +# %USER_CA_xx SSL User certificate issuer attribute xx +# +# %>{Header} HTTP request header "Header" +# %>{Hdr:member} +# HTTP request header "Hdr" list member "member" +# %>{Hdr:;member} +# HTTP request header list member using ; as +# list separator. ; can be any non-alphanumeric +# character. +# +# %<{Header} HTTP reply header "Header" +# %<{Hdr:member} +# HTTP reply header "Hdr" list member "member" +# %<{Hdr:;member} +# HTTP reply header list member using ; as +# list separator. ; can be any non-alphanumeric +# character. +# +# In addition to the above, any string specified in the referencing +# acl will also be included in the helper request line, after the +# specified formats (see the "acl external" directive) +# +# The helper receives lines per the above format specification, +# and returns lines starting with OK or ERR indicating the validity +# of the request and optionally followed by additional keywords with +# more details. +# +# General result syntax: +# +# OK/ERR keyword=value ... +# +# Defined keywords: +# +# user= The users name (login) +# password= The users password (for login= cache_peer option) +# message= Message describing the reason. Available as %o +# in error pages +# tag= Apply a tag to a request (for both ERR and OK results) +# Only sets a tag, does not alter existing tags. +# log= String to be logged in access.log. Available as +# %ea in logformat specifications +# +# If protocol=3.0 (the default) then URL escaping is used to protect +# each value in both requests and responses. +# +# If using protocol=2.5 then all values need to be enclosed in quotes +# if they may contain whitespace, or the whitespace escaped using \. +# And quotes or \ characters within the keyword value must be \ escaped. +# +# When using the concurrency= option the protocol is changed by +# introducing a query channel tag infront of the request/response. +# The query channel tag is a number between 0 and concurrency-1. +#Default: +# none + +# TAG: acl +# Defining an Access List +# +# Every access list definition must begin with an aclname and acltype, +# followed by either type-specific arguments or a quoted filename that +# they are read from. +# +# acl aclname acltype argument ... +# acl aclname acltype "file" ... +# +# When using "file", the file should contain one item per line. +# +# By default, regular expressions are CASE-SENSITIVE. To make +# them case-insensitive, use the -i option. +# +# Some acl types require suspending the current request in order +# to access some external data source. +# Those which do are marked with the tag [slow], those which +# don't are marked as [fast]. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl +# for further information +# +# ***** ACL TYPES AVAILABLE ***** +# +# acl aclname src ip-address/netmask ... # clients IP address [fast] +# acl aclname src addr1-addr2/netmask ... # range of addresses [fast] +# acl aclname dst ip-address/netmask ... # URL host's IP address [slow] +# acl aclname myip ip-address/netmask ... # local socket IP address [fast] +# +# acl aclname arp mac-address ... (xx:xx:xx:xx:xx:xx notation) +# # The arp ACL requires the special configure option --enable-arp-acl. +# # Furthermore, the ARP ACL code is not portable to all operating systems. +# # It works on Linux, Solaris, Windows, FreeBSD, and some +# # other *BSD variants. +# # [fast] +# # +# # NOTE: Squid can only determine the MAC address for clients that are on +# # the same subnet. If the client is on a different subnet, +# # then Squid cannot find out its MAC address. +# +# acl aclname srcdomain .foo.com ... +# # reverse lookup, from client IP [slow] +# acl aclname dstdomain .foo.com ... +# # Destination server from URL [fast] +# acl aclname srcdom_regex [-i] \.foo\.com ... +# # regex matching client name [slow] +# acl aclname dstdom_regex [-i] \.foo\.com ... +# # regex matching server [fast] +# # +# # For dstdomain and dstdom_regex a reverse lookup is tried if a IP +# # based URL is used and no match is found. The name "none" is used +# # if the reverse lookup fails. +# +# acl aclname src_as number ... +# acl aclname dst_as number ... +# # [fast] +# # Except for access control, AS numbers can be used for +# # routing of requests to specific caches. Here's an +# # example for routing all requests for AS#1241 and only +# # those to mycache.mydomain.net: +# # acl asexample dst_as 1241 +# # cache_peer_access mycache.mydomain.net allow asexample +# # cache_peer_access mycache_mydomain.net deny all +# +# acl aclname peername myPeer ... +# # [fast] +# # match against a named cache_peer entry +# # set unique name= on cache_peer lines for reliable use. +# +# acl aclname time [day-abbrevs] [h1:m1-h2:m2] +# # [fast] +# # day-abbrevs: +# # S - Sunday +# # M - Monday +# # T - Tuesday +# # W - Wednesday +# # H - Thursday +# # F - Friday +# # A - Saturday +# # h1:m1 must be less than h2:m2 +# +# acl aclname url_regex [-i] ^http:// ... +# # regex matching on whole URL [fast] +# acl aclname urlpath_regex [-i] \.gif$ ... +# # regex matching on URL path [fast] +# +# acl aclname port 80 70 21 0-1024... # destination TCP port [fast] +# # ranges are alloed +# acl aclname myport 3128 ... # local socket TCP port [fast] +# acl aclname myportname 3128 ... # http(s)_port name [fast] +# +# acl aclname proto HTTP FTP ... # request protocol [fast] +# +# acl aclname method GET POST ... # HTTP request method [fast] +# +# acl aclname http_status 200 301 500- 400-403 ... +# # status code in reply [fast] +# +# acl aclname browser [-i] regexp ... +# # pattern match on User-Agent header (see also req_header below) [fast] +# +# acl aclname referer_regex [-i] regexp ... +# # pattern match on Referer header [fast] +# # Referer is highly unreliable, so use with care +# +# acl aclname ident username ... +# acl aclname ident_regex [-i] pattern ... +# # string match on ident output [slow] +# # use REQUIRED to accept any non-null ident. +# +# acl aclname proxy_auth [-i] username ... +# acl aclname proxy_auth_regex [-i] pattern ... +# # perform http authentication challenge to the client and match against +# # supplied credentials [slow] +# # +# # takes a list of allowed usernames. +# # use REQUIRED to accept any valid username. +# # +# # Will use proxy authentication in forward-proxy scenarios, and plain +# # http authenticaiton in reverse-proxy scenarios +# # +# # NOTE: when a Proxy-Authentication header is sent but it is not +# # needed during ACL checking the username is NOT logged +# # in access.log. +# # +# # NOTE: proxy_auth requires a EXTERNAL authentication program +# # to check username/password combinations (see +# # auth_param directive). +# # +# # NOTE: proxy_auth can't be used in a transparent/intercepting proxy +# # as the browser needs to be configured for using a proxy in order +# # to respond to proxy authentication. +# +# acl aclname snmp_community string ... +# # A community string to limit access to your SNMP Agent [fast] +# # Example: +# # +# # acl snmppublic snmp_community public +# +# acl aclname maxconn number +# # This will be matched when the client's IP address has +# # more than <number> TCP connections established. [fast] +# # NOTE: This only measures direct TCP links so X-Forwarded-For +# # indirect clients are not counted. +# +# acl aclname max_user_ip [-s] number +# # This will be matched when the user attempts to log in from more +# # than <number> different ip addresses. The authenticate_ip_ttl +# # parameter controls the timeout on the ip entries. [fast] +# # If -s is specified the limit is strict, denying browsing +# # from any further IP addresses until the ttl has expired. Without +# # -s Squid will just annoy the user by "randomly" denying requests. +# # (the counter is reset each time the limit is reached and a +# # request is denied) +# # NOTE: in acceleration mode or where there is mesh of child proxies, +# # clients may appear to come from multiple addresses if they are +# # going through proxy farms, so a limit of 1 may cause user problems. +# +# acl aclname req_mime_type [-i] mime-type ... +# # regex match against the mime type of the request generated +# # by the client. Can be used to detect file upload or some +# # types HTTP tunneling requests [fast] +# # NOTE: This does NOT match the reply. You cannot use this +# # to match the returned file type. +# +# acl aclname req_header header-name [-i] any\.regex\.here +# # regex match against any of the known request headers. May be +# # thought of as a superset of "browser", "referer" and "mime-type" +# # ACL [fast] +# +# acl aclname rep_mime_type [-i] mime-type ... +# # regex match against the mime type of the reply received by +# # squid. Can be used to detect file download or some +# # types HTTP tunneling requests. [fast] +# # NOTE: This has no effect in http_access rules. It only has +# # effect in rules that affect the reply data stream such as +# # http_reply_access. +# +# acl aclname rep_header header-name [-i] any\.regex\.here +# # regex match against any of the known reply headers. May be +# # thought of as a superset of "browser", "referer" and "mime-type" +# # ACLs [fast] +# +# acl aclname external class_name [arguments...] +# # external ACL lookup via a helper class defined by the +# # external_acl_type directive [slow] +# +# acl aclname user_cert attribute values... +# # match against attributes in a user SSL certificate +# # attribute is one of DN/C/O/CN/L/ST [fast] +# +# acl aclname ca_cert attribute values... +# # match against attributes a users issuing CA SSL certificate +# # attribute is one of DN/C/O/CN/L/ST [fast] +# +# acl aclname ext_user username ... +# acl aclname ext_user_regex [-i] pattern ... +# # string match on username returned by external acl helper [slow] +# # use REQUIRED to accept any non-null user name. +# +# acl aclname tag tagvalue ... +# # string match on tag returned by external acl helper [slow] +# +# Examples: +# acl macaddress arp 09:00:2b:23:45:67 +# acl myexample dst_as 1241 +# acl password proxy_auth REQUIRED +# acl fileupload req_mime_type -i ^multipart/form-data$ +# acl javascript rep_mime_type -i ^application/x-javascript$ +# +#Default: +# acl all src all +# +# +# Recommended minimum configuration: +# +acl manager proto cache_object +acl localhost src 127.0.0.1/32 ::1 +acl to_localhost dst 127.0.0.0/8 0.0.0.0/32 ::1 + +# Example rule allowing access from your local networks. +# Adapt to list your (internal) IP networks from where browsing +# should be allowed +acl localnet src 10.0.0.0/8 # RFC1918 possible internal network +acl localnet src 172.16.0.0/12 # RFC1918 possible internal network +acl localnet src 192.168.0.0/16 # RFC1918 possible internal network +acl localnet src fc00::/7 # RFC 4193 local private network range +acl localnet src fe80::/10 # RFC 4291 link-local (directly plugged) machines + +acl SSL_ports port 443 +acl Safe_ports port 80 # http +acl Safe_ports port 21 # ftp +acl Safe_ports port 443 # https +acl Safe_ports port 70 # gopher +acl Safe_ports port 210 # wais +acl Safe_ports port 1025-65535 # unregistered ports +acl Safe_ports port 280 # http-mgmt +acl Safe_ports port 488 # gss-http +acl Safe_ports port 591 # filemaker +acl Safe_ports port 777 # multiling http +acl CONNECT method CONNECT + +# TAG: follow_x_forwarded_for +# Allowing or Denying the X-Forwarded-For header to be followed to +# find the original source of a request. +# +# Requests may pass through a chain of several other proxies +# before reaching us. The X-Forwarded-For header will contain a +# comma-separated list of the IP addresses in the chain, with the +# rightmost address being the most recent. +# +# If a request reaches us from a source that is allowed by this +# configuration item, then we consult the X-Forwarded-For header +# to see where that host received the request from. If the +# X-Forwarded-For header contains multiple addresses, we continue +# backtracking until we reach an address for which we are not allowed +# to follow the X-Forwarded-For header, or until we reach the first +# address in the list. For the purpose of ACL used in the +# follow_x_forwarded_for directive the src ACL type always matches +# the address we are testing and srcdomain matches its rDNS. +# +# The end result of this process is an IP address that we will +# refer to as the indirect client address. This address may +# be treated as the client address for access control, ICAP, delay +# pools and logging, depending on the acl_uses_indirect_client, +# icap_uses_indirect_client, delay_pool_uses_indirect_client and +# log_uses_indirect_client options. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +# SECURITY CONSIDERATIONS: +# +# Any host for which we follow the X-Forwarded-For header +# can place incorrect information in the header, and Squid +# will use the incorrect information as if it were the +# source address of the request. This may enable remote +# hosts to bypass any access control restrictions that are +# based on the client's source addresses. +# +# For example: +# +# acl localhost src 127.0.0.1 +# acl my_other_proxy srcdomain .proxy.example.com +# follow_x_forwarded_for allow localhost +# follow_x_forwarded_for allow my_other_proxy +#Default: +# follow_x_forwarded_for deny all + +# TAG: acl_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in acl matching. +# +# NOTE: maxconn ACL considers direct TCP links and indirect +# clients will always have zero. So no match. +#Default: +# acl_uses_indirect_client on + +# TAG: delay_pool_uses_indirect_client on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-follow-x-forwarded-for and --enable-delay-pools option +# +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in delay pools. +#Default: +# delay_pool_uses_indirect_client on + +# TAG: log_uses_indirect_client on|off +# Controls whether the indirect client address +# (see follow_x_forwarded_for) is used instead of the +# direct client address in the access log. +#Default: +# log_uses_indirect_client on + +# TAG: http_access +# Allowing or Denying access based on defined access lists +# +# Access to the HTTP port: +# http_access allow|deny [!]aclname ... +# +# NOTE on default values: +# +# If there are no "access" lines present, the default is to deny +# the request. +# +# If none of the "access" lines cause a match, the default is the +# opposite of the last line in the list. If the last line was +# deny, the default is allow. Conversely, if the last line +# is allow, the default will be deny. For these reasons, it is a +# good idea to have an "deny all" entry at the end of your access +# lists to avoid potential confusion. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +#Default: +# http_access deny all +# + +# +# Recommended minimum Access Permission configuration: +# +# Only allow cachemgr access from localhost +http_access allow manager localhost +http_access deny manager + +# Deny requests to certain unsafe ports +http_access deny !Safe_ports + +# Deny CONNECT to other than secure SSL ports +http_access deny CONNECT !SSL_ports + +# We strongly recommend the following be uncommented to protect innocent +# web applications running on the proxy server who think the only +# one who can access services on "localhost" is a local user +#http_access deny to_localhost + +# +# INSERT YOUR OWN RULE(S) HERE TO ALLOW ACCESS FROM YOUR CLIENTS +# + +# Example rule allowing access from your local networks. +# Adapt localnet in the ACL section to list your (internal) IP networks +# from where browsing should be allowed +http_access allow localnet +http_access allow localhost + +# And finally deny all other access to this proxy +http_access deny all + +# TAG: adapted_http_access +# Allowing or Denying access based on defined access lists +# +# Essentially identical to http_access, but runs after redirectors +# and ICAP/eCAP adaptation. Allowing access control based on their +# output. +# +# If not set then only http_access is used. +#Default: +# none + +# TAG: http_reply_access +# Allow replies to client requests. This is complementary to http_access. +# +# http_reply_access allow|deny [!] aclname ... +# +# NOTE: if there are no access lines present, the default is to allow +# all replies +# +# If none of the access lines cause a match the opposite of the +# last line will apply. Thus it is good practice to end the rules +# with an "allow all" or "deny all" entry. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: icp_access +# Allowing or Denying access to the ICP port based on defined +# access lists +# +# icp_access allow|deny [!]aclname ... +# +# See http_access for details +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow ICP queries from local networks only +##icp_access allow localnet +##icp_access deny all +#Default: +# icp_access deny all + +# TAG: htcp_access +# Allowing or Denying access to the HTCP port based on defined +# access lists +# +# htcp_access allow|deny [!]aclname ... +# +# See http_access for details +# +# NOTE: The default if no htcp_access lines are present is to +# deny all traffic. This default may cause problems with peers +# using the htcp or htcp-oldsquid options. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow HTCP queries from local networks only +##htcp_access allow localnet +##htcp_access deny all +#Default: +# htcp_access deny all + +# TAG: htcp_clr_access +# Allowing or Denying access to purge content using HTCP based +# on defined access lists +# +# htcp_clr_access allow|deny [!]aclname ... +# +# See http_access for details +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +## Allow HTCP CLR requests from trusted peers +#acl htcp_clr_peer src 172.16.1.2 +#htcp_clr_access allow htcp_clr_peer +#Default: +# htcp_clr_access deny all + +# TAG: miss_access +# Use to force your neighbors to use you as a sibling instead of +# a parent. For example: +# +# acl localclients src 172.16.0.0/16 +# miss_access allow localclients +# miss_access deny !localclients +# +# This means only your local clients are allowed to fetch +# MISSES and all other clients can only fetch HITS. +# +# By default, allow all clients who passed the http_access rules +# to fetch MISSES from us. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# miss_access allow all + +# TAG: ident_lookup_access +# A list of ACL elements which, if matched, cause an ident +# (RFC 931) lookup to be performed for this request. For +# example, you might choose to always perform ident lookups +# for your main multi-user Unix boxes, but not for your Macs +# and PCs. By default, ident lookups are not performed for +# any requests. +# +# To enable ident lookups for specific client addresses, you +# can follow this example: +# +# acl ident_aware_hosts src 198.168.1.0/24 +# ident_lookup_access allow ident_aware_hosts +# ident_lookup_access deny all +# +# Only src type ACL checks are fully supported. A srcdomain +# ACL might work at times, but it will not always provide +# the correct result. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# ident_lookup_access deny all + +# TAG: reply_body_max_size size [acl acl...] +# This option specifies the maximum size of a reply body. It can be +# used to prevent users from downloading very large files, such as +# MP3's and movies. When the reply headers are received, the +# reply_body_max_size lines are processed, and the first line where +# all (if any) listed ACLs are true is used as the maximum body size +# for this reply. +# +# This size is checked twice. First when we get the reply headers, +# we check the content-length value. If the content length value exists +# and is larger than the allowed size, the request is denied and the +# user receives an error message that says "the request or reply +# is too large." If there is no content-length, and the reply +# size exceeds this limit, the client's connection is just closed +# and they will receive a partial reply. +# +# WARNING: downstream caches probably can not detect a partial reply +# if there is no content-length header, so they will cache +# partial responses and give them out as hits. You should NOT +# use this option if you have downstream caches. +# +# WARNING: A maximum size smaller than the size of squid's error messages +# will cause an infinite loop and crash squid. Ensure that the smallest +# non-zero value you use is greater that the maximum header size plus +# the size of your largest error page. +# +# If you set this parameter none (the default), there will be +# no limit imposed. +# +# Configuration Format is: +# reply_body_max_size SIZE UNITS [acl ...] +# ie. +# reply_body_max_size 10 MB +# +#Default: +# none + +# NETWORK OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: http_port +# Usage: port [options] +# hostname:port [options] +# 1.2.3.4:port [options] +# +# The socket addresses where Squid will listen for HTTP client +# requests. You may specify multiple socket addresses. +# There are three forms: port alone, hostname with port, and +# IP address with port. If you specify a hostname or IP +# address, Squid binds the socket to that specific +# address. This replaces the old 'tcp_incoming_address' +# option. Most likely, you do not need to bind to a specific +# address, so you can use the port number alone. +# +# If you are running Squid in accelerator mode, you +# probably want to listen on port 80 also, or instead. +# +# The -a command line option may be used to specify additional +# port(s) where Squid listens for proxy request. Such ports will +# be plain proxy ports with no options. +# +# You may specify multiple socket addresses on multiple lines. +# +# Options: +# +# intercept Support for IP-Layer interception of +# outgoing requests without browser settings. +# NP: disables authentication and IPv6 on the port. +# +# tproxy Support Linux TPROXY for spoofing outgoing +# connections using the client IP address. +# NP: disables authentication and maybe IPv6 on the port. +# +# accel Accelerator mode. Also needs at least one of +# vhost / vport / defaultsite. +# +# allow-direct Allow direct forwarding in accelerator mode. Normally +# accelerated requests are denied direct forwarding as if +# never_direct was used. +# +# defaultsite=domainname +# What to use for the Host: header if it is not present +# in a request. Determines what site (not origin server) +# accelerators should consider the default. +# Implies accel. +# +# vhost Accelerator mode using Host header for virtual +# domain support. Implies accel. +# +# vport Accelerator with IP based virtual host support. +# Implies accel. +# +# vport=NN As above, but uses specified port number rather +# than the http_port number. Implies accel. +# +# protocol= Protocol to reconstruct accelerated requests with. +# Defaults to http. +# +# ignore-cc Ignore request Cache-Control headers. +# +# Warning: This option violates HTTP specifications if +# used in non-accelerator setups. +# +# connection-auth[=on|off] +# use connection-auth=off to tell Squid to prevent +# forwarding Microsoft connection oriented authentication +# (NTLM, Negotiate and Kerberos) +# +# disable-pmtu-discovery= +# Control Path-MTU discovery usage: +# off lets OS decide on what to do (default). +# transparent disable PMTU discovery when transparent +# support is enabled. +# always disable always PMTU discovery. +# +# In many setups of transparently intercepting proxies +# Path-MTU discovery can not work on traffic towards the +# clients. This is the case when the intercepting device +# does not fully track connections and fails to forward +# ICMP must fragment messages to the cache server. If you +# have such setup and experience that certain clients +# sporadically hang or never complete requests set +# disable-pmtu-discovery option to 'transparent'. +# +# ssl-bump Intercept each CONNECT request matching ssl_bump ACL, +# establish secure connection with the client and with +# the server, decrypt HTTP messages as they pass through +# Squid, and treat them as unencrypted HTTP messages, +# becoming the man-in-the-middle. +# +# When this option is enabled, additional options become +# available to specify SSL-related properties of the +# client-side connection: cert, key, version, cipher, +# options, clientca, cafile, capath, crlfile, dhparams, +# sslflags, and sslcontext. See the https_port directive +# for more information on these options. +# +# The ssl_bump option is required to fully enable +# the SslBump feature. +# +# name= Specifies a internal name for the port. Defaults to +# the port specification (port or addr:port) +# +# tcpkeepalive[=idle,interval,timeout] +# Enable TCP keepalive probes of idle connections. +# In seconds; idle is the initial time before TCP starts +# probing the connection, interval how often to probe, and +# timeout the time before giving up. +# +# If you run Squid on a dual-homed machine with an internal +# and an external interface we recommend you to specify the +# internal address:port in http_port. This way Squid will only be +# visible on the internal address. +# +# + +# Squid normally listens to port 3128 +http_port 3128 + +# TAG: https_port +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Usage: [ip:]port cert=certificate.pem [key=key.pem] [options...] +# +# The socket address where Squid will listen for HTTPS client +# requests. +# +# This is really only useful for situations where you are running +# squid in accelerator mode and you want to do the SSL work at the +# accelerator level. +# +# You may specify multiple socket addresses on multiple lines, +# each with their own SSL certificate and/or options. +# +# Options: +# +# accel Accelerator mode. Also needs at least one of +# defaultsite or vhost. +# +# defaultsite= The name of the https site presented on +# this port. Implies accel. +# +# vhost Accelerator mode using Host header for virtual +# domain support. Requires a wildcard certificate +# or other certificate valid for more than one domain. +# Implies accel. +# +# protocol= Protocol to reconstruct accelerated requests with. +# Defaults to https. +# +# cert= Path to SSL certificate (PEM format). +# +# key= Path to SSL private key file (PEM format) +# if not specified, the certificate file is +# assumed to be a combined certificate and +# key file. +# +# version= The version of SSL/TLS supported +# 1 automatic (default) +# 2 SSLv2 only +# 3 SSLv3 only +# 4 TLSv1 only +# +# cipher= Colon separated list of supported ciphers. +# +# options= Various SSL engine options. The most important +# being: +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1 +# SINGLE_DH_USE Always create a new key when using +# temporary/ephemeral DH key exchanges +# See src/ssl_support.c or OpenSSL SSL_CTX_set_options +# documentation for a complete list of options. +# +# clientca= File containing the list of CAs to use when +# requesting a client certificate. +# +# cafile= File containing additional CA certificates to +# use when verifying client certificates. If unset +# clientca will be used. +# +# capath= Directory containing additional CA certificates +# and CRL lists to use when verifying client certificates. +# +# crlfile= File of additional CRL lists to use when verifying +# the client certificate, in addition to CRLs stored in +# the capath. Implies VERIFY_CRL flag below. +# +# dhparams= File containing DH parameters for temporary/ephemeral +# DH key exchanges. +# +# sslflags= Various flags modifying the use of SSL: +# DELAYED_AUTH +# Don't request client certificates +# immediately, but wait until acl processing +# requires a certificate (not yet implemented). +# NO_DEFAULT_CA +# Don't use the default CA lists built in +# to OpenSSL. +# NO_SESSION_REUSE +# Don't allow for session reuse. Each connection +# will result in a new SSL session. +# VERIFY_CRL +# Verify CRL lists when accepting client +# certificates. +# VERIFY_CRL_ALL +# Verify CRL lists for all certificates in the +# client certificate chain. +# +# sslcontext= SSL session ID context identifier. +# +# vport Accelerator with IP based virtual host support. +# +# vport=NN As above, but uses specified port number rather +# than the https_port number. Implies accel. +# +# name= Specifies a internal name for the port. Defaults to +# the port specification (port or addr:port) +# +#Default: +# none + +# TAG: tcp_outgoing_tos +# Allows you to select a TOS/Diffserv value to mark outgoing +# connections with, based on the username or source address +# making the request. +# +# tcp_outgoing_tos ds-field [!]aclname ... +# +# Example where normal_service_net uses the TOS value 0x00 +# and good_service_net uses 0x20 +# +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.1.0/24 +# tcp_outgoing_tos 0x00 normal_service_net +# tcp_outgoing_tos 0x20 good_service_net +# +# TOS/DSCP values really only have local significance - so you should +# know what you're specifying. For more information, see RFC2474, +# RFC2475, and RFC3260. +# +# The TOS/DSCP byte must be exactly that - a octet value 0 - 255, or +# "default" to use whatever default your host has. Note that in +# practice often only multiples of 4 is usable as the two rightmost bits +# have been redefined for use by ECN (RFC 3168 section 23.1). +# +# Processing proceeds in the order specified, and stops at first fully +# matching line. +# +# Note: The use of this directive using client dependent ACLs is +# incompatible with the use of server side persistent connections. To +# ensure correct results it is best to set server_persisten_connections +# to off when using this directive in such configurations. +#Default: +# none + +# TAG: clientside_tos +# Allows you to select a TOS/Diffserv value to mark client-side +# connections with, based on the username or source address +# making the request. +#Default: +# none + +# TAG: qos_flows +# Note: This option is only available if Squid is rebuilt with the +# --enable-zph-qos option +# +# Allows you to select a TOS/DSCP value to mark outgoing +# connections with, based on where the reply was sourced. +# +# TOS values really only have local significance - so you should +# know what you're specifying. For more information, see RFC2474, +# RFC2475, and RFC3260. +# +# The TOS/DSCP byte must be exactly that - octet value 0x00-0xFF. +# Note that in practice often only values up to 0x3F are usable +# as the two highest bits have been redefined for use by ECN +# (RFC3168). +# +# This setting is configured by setting the source TOS values: +# +# local-hit=0xFF Value to mark local cache hits. +# +# sibling-hit=0xFF Value to mark hits from sibling peers. +# +# parent-hit=0xFF Value to mark hits from parent peers. +# +# +# NOTE: 'miss' preserve feature is only possible on Linux at this time. +# +# For the following to work correctly, you will need to patch your +# linux kernel with the TOS preserving ZPH patch. +# The kernel patch can be downloaded from http://zph.bratcheda.org +# +# disable-preserve-miss +# By default, the existing TOS value of the response coming +# from the remote server will be retained and masked with +# miss-mark. This option disables that feature. +# +# miss-mask=0xFF +# Allows you to mask certain bits in the TOS received from the +# remote server, before copying the value to the TOS sent +# towards clients. +# Default: 0xFF (TOS from server is not changed). +# +#Default: +# none + +# TAG: tcp_outgoing_address +# Allows you to map requests to different outgoing IP addresses +# based on the username or source address of the user making +# the request. +# +# tcp_outgoing_address ipaddr [[!]aclname] ... +# +# Example where requests from 10.0.0.0/24 will be forwarded +# with source address 10.1.0.1, 10.0.2.0/24 forwarded with +# source address 10.1.0.2 and the rest will be forwarded with +# source address 10.1.0.3. +# +# acl normal_service_net src 10.0.0.0/24 +# acl good_service_net src 10.0.2.0/24 +# tcp_outgoing_address 10.1.0.1 normal_service_net +# tcp_outgoing_address 10.1.0.2 good_service_net +# tcp_outgoing_address 10.1.0.3 +# +# Processing proceeds in the order specified, and stops at first fully +# matching line. +# +# Note: The use of this directive using client dependent ACLs is +# incompatible with the use of server side persistent connections. To +# ensure correct results it is best to set server_persistent_connections +# to off when using this directive in such configurations. +# +# +# IPv6 Magic: +# +# Squid is built with a capability of bridging the IPv4 and IPv6 +# internets. +# tcp_outgoing_address as exampled above breaks this bridging by forcing +# all outbound traffic through a certain IPv4 which may be on the wrong +# side of the IPv4/IPv6 boundary. +# +# To operate with tcp_outgoing_address and keep the bridging benefits +# an additional ACL needs to be used which ensures the IPv6-bound traffic +# is never forced or permitted out the IPv4 interface. +# +# # IPv6 destination test along with a dummy access control to perofrm the required DNS +# # This MUST be place before any ALLOW rules. +# acl to_ipv6 dst ipv6 +# http_access deny ipv6 !all +# +# tcp_outgoing_address 2001:db8::c001 good_service_net to_ipv6 +# tcp_outgoing_address 10.1.0.2 good_service_net !to_ipv6 +# +# tcp_outgoing_address 2001:db8::beef normal_service_net to_ipv6 +# tcp_outgoing_address 10.1.0.1 normal_service_net !to_ipv6 +# +# tcp_outgoing_address 2001:db8::1 to_ipv6 +# tcp_outgoing_address 10.1.0.3 !to_ipv6 +# +# WARNING: +# 'dst ipv6' bases its selection assuming DIRECT access. +# If peers are used the peername ACL are needed to select outgoing +# address which can link to the peer. +# +# 'dst ipv6' is a slow ACL. It will only work here if 'dst' is used +# previously in the http_access rules to locate the destination IP. +# Some more magic may be needed for that: +# http_access allow to_ipv6 !all +# (meaning, allow if to IPv6 but not from anywhere ;) +# +#Default: +# none + +# SSL OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: ssl_unclean_shutdown +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Some browsers (especially MSIE) bugs out on SSL shutdown +# messages. +#Default: +# ssl_unclean_shutdown off + +# TAG: ssl_engine +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# The OpenSSL engine to use. You will need to set this if you +# would like to use hardware SSL acceleration for example. +#Default: +# none + +# TAG: sslproxy_client_certificate +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Client SSL Certificate to use when proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_client_key +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Client SSL Key to use when proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_version +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# SSL version level to use when proxying https:// URLs +#Default: +# sslproxy_version 1 + +# TAG: sslproxy_options +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# SSL engine options to use when proxying https:// URLs +# +# The most important being: +# +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1 +# SINGLE_DH_USE +# Always create a new key when using +# temporary/ephemeral DH key exchanges +# +# These options vary depending on your SSL engine. +# See the OpenSSL SSL_CTX_set_options documentation for a +# complete list of possible options. +#Default: +# none + +# TAG: sslproxy_cipher +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# SSL cipher list to use when proxying https:// URLs +# +# Colon separated list of supported ciphers. +#Default: +# none + +# TAG: sslproxy_cafile +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# file containing CA certificates to use when verifying server +# certificates while proxying https:// URLs +#Default: +# none + +# TAG: sslproxy_capath +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# directory containing CA certificates to use when verifying +# server certificates while proxying https:// URLs +#Default: +# none + +# TAG: ssl_bump +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# This ACL controls which CONNECT requests to an http_port +# marked with an sslBump flag are actually "bumped". Please +# see the sslBump flag of an http_port option for more details +# about decoding proxied SSL connections. +# +# By default, no requests are bumped. +# +# See also: http_port sslBump +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +# +# # Example: Bump all requests except those originating from localhost and +# # those going to webax.com or example.com sites. +# +# acl localhost src 127.0.0.1/32 +# acl broken_sites dstdomain .webax.com +# acl broken_sites dstdomain .example.com +# ssl_bump deny localhost +# ssl_bump deny broken_sites +# ssl_bump allow all +#Default: +# none + +# TAG: sslproxy_flags +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Various flags modifying the use of SSL while proxying https:// URLs: +# DONT_VERIFY_PEER Accept certificates that fail verification. +# For refined control, see sslproxy_cert_error. +# NO_DEFAULT_CA Don't use the default CA list built in +# to OpenSSL. +#Default: +# none + +# TAG: sslproxy_cert_error +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Use this ACL to bypass server certificate validation errors. +# +# For example, the following lines will bypass all validation errors +# when talking to servers located at 172.16.0.0/16. All other +# validation errors will result in ERR_SECURE_CONNECT_FAIL error. +# +# acl BrokenServersAtTrustedIP dst 172.16.0.0/16 +# sslproxy_cert_error allow BrokenServersAtTrustedIP +# sslproxy_cert_error deny all +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# Using slow acl types may result in server crashes +# +# Without this option, all server certificate validation errors +# terminate the transaction. Bypassing validation errors is dangerous +# because an error usually implies that the server cannot be trusted and +# the connection may be insecure. +# +# See also: sslproxy_flags and DONT_VERIFY_PEER. +# +# Default setting: sslproxy_cert_error deny all +#Default: +# none + +# TAG: sslpassword_program +# Note: This option is only available if Squid is rebuilt with the +# --enable-ssl option +# +# Specify a program used for entering SSL key passphrases +# when using encrypted SSL certificate keys. If not specified +# keys must either be unencrypted, or Squid started with the -N +# option to allow it to query interactively for the passphrase. +# +# The key file name is given as argument to the program allowing +# selection of the right password if you have multiple encrypted +# keys. +#Default: +# none + +# OPTIONS WHICH AFFECT THE NEIGHBOR SELECTION ALGORITHM +# ----------------------------------------------------------------------------- + +# TAG: cache_peer +# To specify other caches in a hierarchy, use the format: +# +# cache_peer hostname type http-port icp-port [options] +# +# For example, +# +# # proxy icp +# # hostname type port port options +# # -------------------- -------- ----- ----- ----------- +# cache_peer parent.foo.net parent 3128 3130 default +# cache_peer sib1.foo.net sibling 3128 3130 proxy-only +# cache_peer sib2.foo.net sibling 3128 3130 proxy-only +# cache_peer example.com parent 80 0 no-query default +# cache_peer cdn.example.com sibling 3128 0 +# +# type: either 'parent', 'sibling', or 'multicast'. +# +# proxy-port: The port number where the peer accept HTTP requests. +# For other Squid proxies this is usually 3128 +# For web servers this is usually 80 +# +# icp-port: Used for querying neighbor caches about objects. +# Set to 0 if the peer does not support ICP or HTCP. +# See ICP and HTCP options below for additional details. +# +# +# ==== ICP OPTIONS ==== +# +# You MUST also set icp_port and icp_access explicitly when using these options. +# The defaults will prevent peer traffic using ICP. +# +# +# no-query Disable ICP queries to this neighbor. +# +# multicast-responder +# Indicates the named peer is a member of a multicast group. +# ICP queries will not be sent directly to the peer, but ICP +# replies will be accepted from it. +# +# closest-only Indicates that, for ICP_OP_MISS replies, we'll only forward +# CLOSEST_PARENT_MISSes and never FIRST_PARENT_MISSes. +# +# background-ping +# To only send ICP queries to this neighbor infrequently. +# This is used to keep the neighbor round trip time updated +# and is usually used in conjunction with weighted-round-robin. +# +# +# ==== HTCP OPTIONS ==== +# +# You MUST also set htcp_port and htcp_access explicitly when using these options. +# The defaults will prevent peer traffic using HTCP. +# +# +# htcp Send HTCP, instead of ICP, queries to the neighbor. +# You probably also want to set the "icp-port" to 4827 +# instead of 3130. +# +# htcp-oldsquid Send HTCP to old Squid versions. +# +# htcp-no-clr Send HTCP to the neighbor but without +# sending any CLR requests. This cannot be used with +# htcp-only-clr. +# +# htcp-only-clr Send HTCP to the neighbor but ONLY CLR requests. +# This cannot be used with htcp-no-clr. +# +# htcp-no-purge-clr +# Send HTCP to the neighbor including CLRs but only when +# they do not result from PURGE requests. +# +# htcp-forward-clr +# Forward any HTCP CLR requests this proxy receives to the peer. +# +# +# ==== PEER SELECTION METHODS ==== +# +# The default peer selection method is ICP, with the first responding peer +# being used as source. These options can be used for better load balancing. +# +# +# default This is a parent cache which can be used as a "last-resort" +# if a peer cannot be located by any of the peer-selection methods. +# If specified more than once, only the first is used. +# +# round-robin Load-Balance parents which should be used in a round-robin +# fashion in the absence of any ICP queries. +# weight=N can be used to add bias. +# +# weighted-round-robin +# Load-Balance parents which should be used in a round-robin +# fashion with the frequency of each parent being based on the +# round trip time. Closer parents are used more often. +# Usually used for background-ping parents. +# weight=N can be used to add bias. +# +# carp Load-Balance parents which should be used as a CARP array. +# The requests will be distributed among the parents based on the +# CARP load balancing hash function based on their weight. +# +# userhash Load-balance parents based on the client proxy_auth or ident username. +# +# sourcehash Load-balance parents based on the client source IP. +# +# multicast-siblings +# To be used only for cache peers of type "multicast". +# ALL members of this multicast group have "sibling" +# relationship with it, not "parent". This is to a mulicast +# group when the requested object would be fetched only from +# a "parent" cache, anyway. It's useful, e.g., when +# configuring a pool of redundant Squid proxies, being +# members of the same multicast group. +# +# +# ==== PEER SELECTION OPTIONS ==== +# +# weight=N use to affect the selection of a peer during any weighted +# peer-selection mechanisms. +# The weight must be an integer; default is 1, +# larger weights are favored more. +# This option does not affect parent selection if a peering +# protocol is not in use. +# +# basetime=N Specify a base amount to be subtracted from round trip +# times of parents. +# It is subtracted before division by weight in calculating +# which parent to fectch from. If the rtt is less than the +# base time the rtt is set to a minimal value. +# +# ttl=N Specify a TTL to use when sending multicast ICP queries +# to this address. +# Only useful when sending to a multicast group. +# Because we don't accept ICP replies from random +# hosts, you must configure other group members as +# peers with the 'multicast-responder' option. +# +# no-delay To prevent access to this neighbor from influencing the +# delay pools. +# +# digest-url=URL Tell Squid to fetch the cache digest (if digests are +# enabled) for this host from the specified URL rather +# than the Squid default location. +# +# +# ==== ACCELERATOR / REVERSE-PROXY OPTIONS ==== +# +# originserver Causes this parent to be contacted as an origin server. +# Meant to be used in accelerator setups when the peer +# is a web server. +# +# forceddomain=name +# Set the Host header of requests forwarded to this peer. +# Useful in accelerator setups where the server (peer) +# expects a certain domain name but clients may request +# others. ie example.com or www.example.com +# +# no-digest Disable request of cache digests. +# +# no-netdb-exchange +# Disables requesting ICMP RTT database (NetDB). +# +# +# ==== AUTHENTICATION OPTIONS ==== +# +# login=user:password +# If this is a personal/workgroup proxy and your parent +# requires proxy authentication. +# +# Note: The string can include URL escapes (i.e. %20 for +# spaces). This also means % must be written as %%. +# +# login=PROXYPASS +# Send login details received from client to this peer. +# Authentication is not required, nor changed. +# +# Note: This will pass any form of authentication but +# only Basic auth will work through a proxy unless the +# connection-auth options are also used. +# +# login=PASS Send login details received from client to this peer. +# Authentication is not required by this option. +# If there are no client-provided authentication headers +# to pass on, but username and password are available +# from either proxy login or an external ACL user= and +# password= result tags they may be sent instead. +# +# Note: To combine this with proxy_auth both proxies must +# share the same user database as HTTP only allows for +# a single login (one for proxy, one for origin server). +# Also be warned this will expose your users proxy +# password to the peer. USE WITH CAUTION +# +# login=*:password +# Send the username to the upstream cache, but with a +# fixed password. This is meant to be used when the peer +# is in another administrative domain, but it is still +# needed to identify each user. +# The star can optionally be followed by some extra +# information which is added to the username. This can +# be used to identify this proxy to the peer, similar to +# the login=username:password option above. +# +# connection-auth=on|off +# Tell Squid that this peer does or not support Microsoft +# connection oriented authentication, and any such +# challenges received from there should be ignored. +# Default is auto to automatically determine the status +# of the peer. +# +# +# ==== SSL / HTTPS / TLS OPTIONS ==== +# +# ssl Encrypt connections to this peer with SSL/TLS. +# +# sslcert=/path/to/ssl/certificate +# A client SSL certificate to use when connecting to +# this peer. +# +# sslkey=/path/to/ssl/key +# The private SSL key corresponding to sslcert above. +# If 'sslkey' is not specified 'sslcert' is assumed to +# reference a combined file containing both the +# certificate and the key. +# +# sslversion=1|2|3|4 +# The SSL version to use when connecting to this peer +# 1 = automatic (default) +# 2 = SSL v2 only +# 3 = SSL v3 only +# 4 = TLS v1 only +# +# sslcipher=... The list of valid SSL ciphers to use when connecting +# to this peer. +# +# ssloptions=... Specify various SSL engine options: +# NO_SSLv2 Disallow the use of SSLv2 +# NO_SSLv3 Disallow the use of SSLv3 +# NO_TLSv1 Disallow the use of TLSv1 +# See src/ssl_support.c or the OpenSSL documentation for +# a more complete list. +# +# sslcafile=... A file containing additional CA certificates to use +# when verifying the peer certificate. +# +# sslcapath=... A directory containing additional CA certificates to +# use when verifying the peer certificate. +# +# sslcrlfile=... A certificate revocation list file to use when +# verifying the peer certificate. +# +# sslflags=... Specify various flags modifying the SSL implementation: +# +# DONT_VERIFY_PEER +# Accept certificates even if they fail to +# verify. +# NO_DEFAULT_CA +# Don't use the default CA list built in +# to OpenSSL. +# DONT_VERIFY_DOMAIN +# Don't verify the peer certificate +# matches the server name +# +# ssldomain= The peer name as advertised in it's certificate. +# Used for verifying the correctness of the received peer +# certificate. If not specified the peer hostname will be +# used. +# +# front-end-https +# Enable the "Front-End-Https: On" header needed when +# using Squid as a SSL frontend in front of Microsoft OWA. +# See MS KB document Q307347 for details on this header. +# If set to auto the header will only be added if the +# request is forwarded as a https:// URL. +# +# +# ==== GENERAL OPTIONS ==== +# +# connect-timeout=N +# A peer-specific connect timeout. +# Also see the peer_connect_timeout directive. +# +# connect-fail-limit=N +# How many times connecting to a peer must fail before +# it is marked as down. Default is 10. +# +# allow-miss Disable Squid's use of only-if-cached when forwarding +# requests to siblings. This is primarily useful when +# icp_hit_stale is used by the sibling. To extensive use +# of this option may result in forwarding loops, and you +# should avoid having two-way peerings with this option. +# For example to deny peer usage on requests from peer +# by denying cache_peer_access if the source is a peer. +# +# max-conn=N Limit the amount of connections Squid may open to this +# peer. see also +# +# name=xxx Unique name for the peer. +# Required if you have multiple peers on the same host +# but different ports. +# This name can be used in cache_peer_access and similar +# directives to dentify the peer. +# Can be used by outgoing access controls through the +# peername ACL type. +# +# no-tproxy Do not use the client-spoof TPROXY support when forwarding +# requests to this peer. Use normal address selection instead. +# +# proxy-only objects fetched from the peer will not be stored locally. +# +#Default: +# none + +# TAG: cache_peer_domain +# Use to limit the domains for which a neighbor cache will be +# queried. Usage: +# +# cache_peer_domain cache-host domain [domain ...] +# cache_peer_domain cache-host !domain +# +# For example, specifying +# +# cache_peer_domain parent.foo.net .edu +# +# has the effect such that UDP query packets are sent to +# 'bigserver' only when the requested object exists on a +# server in the .edu domain. Prefixing the domainname +# with '!' means the cache will be queried for objects +# NOT in that domain. +# +# NOTE: * Any number of domains may be given for a cache-host, +# either on the same or separate lines. +# * When multiple domains are given for a particular +# cache-host, the first matched domain is applied. +# * Cache hosts with no domain restrictions are queried +# for all requests. +# * There are no defaults. +# * There is also a 'cache_peer_access' tag in the ACL +# section. +#Default: +# none + +# TAG: cache_peer_access +# Similar to 'cache_peer_domain' but provides more flexibility by +# using ACL elements. +# +# cache_peer_access cache-host allow|deny [!]aclname ... +# +# The syntax is identical to 'http_access' and the other lists of +# ACL elements. See the comments for 'http_access' below, or +# the Squid FAQ (http://wiki.squid-cache.org/SquidFaq/SquidAcl). +#Default: +# none + +# TAG: neighbor_type_domain +# usage: neighbor_type_domain neighbor parent|sibling domain domain ... +# +# Modifying the neighbor type for specific domains is now +# possible. You can treat some domains differently than the the +# default neighbor type specified on the 'cache_peer' line. +# Normally it should only be necessary to list domains which +# should be treated differently because the default neighbor type +# applies for hostnames which do not match domains listed here. +# +#EXAMPLE: +# cache_peer cache.foo.org parent 3128 3130 +# neighbor_type_domain cache.foo.org sibling .com .net +# neighbor_type_domain cache.foo.org sibling .au .de +#Default: +# none + +# TAG: dead_peer_timeout (seconds) +# This controls how long Squid waits to declare a peer cache +# as "dead." If there are no ICP replies received in this +# amount of time, Squid will declare the peer dead and not +# expect to receive any further ICP replies. However, it +# continues to send ICP queries, and will mark the peer as +# alive upon receipt of the first subsequent ICP reply. +# +# This timeout also affects when Squid expects to receive ICP +# replies from peers. If more than 'dead_peer' seconds have +# passed since the last ICP reply was received, Squid will not +# expect to receive an ICP reply on the next query. Thus, if +# your time between requests is greater than this timeout, you +# will see a lot of requests sent DIRECT to origin servers +# instead of to your parents. +#Default: +# dead_peer_timeout 10 seconds + +# TAG: forward_max_tries +# Controls how many different forward paths Squid will try +# before giving up. See also forward_timeout. +#Default: +# forward_max_tries 10 + +# TAG: hierarchy_stoplist +# A list of words which, if found in a URL, cause the object to +# be handled directly by this cache. In other words, use this +# to not query neighbor caches for certain objects. You may +# list this option multiple times. +# Note: never_direct overrides this option. +# + +# We recommend you to use at least the following line. +hierarchy_stoplist cgi-bin ? + +# MEMORY CACHE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: cache_mem (bytes) +# NOTE: THIS PARAMETER DOES NOT SPECIFY THE MAXIMUM PROCESS SIZE. +# IT ONLY PLACES A LIMIT ON HOW MUCH ADDITIONAL MEMORY SQUID WILL +# USE AS A MEMORY CACHE OF OBJECTS. SQUID USES MEMORY FOR OTHER +# THINGS AS WELL. SEE THE SQUID FAQ SECTION 8 FOR DETAILS. +# +# 'cache_mem' specifies the ideal amount of memory to be used +# for: +# * In-Transit objects +# * Hot Objects +# * Negative-Cached objects +# +# Data for these objects are stored in 4 KB blocks. This +# parameter specifies the ideal upper limit on the total size of +# 4 KB blocks allocated. In-Transit objects take the highest +# priority. +# +# In-transit objects have priority over the others. When +# additional space is needed for incoming data, negative-cached +# and hot objects will be released. In other words, the +# negative-cached and hot objects will fill up any unused space +# not needed for in-transit objects. +# +# If circumstances require, this limit will be exceeded. +# Specifically, if your incoming request rate requires more than +# 'cache_mem' of memory to hold in-transit objects, Squid will +# exceed this limit to satisfy the new requests. When the load +# decreases, blocks will be freed until the high-water mark is +# reached. Thereafter, blocks will be used to store hot +# objects. +#Default: +# cache_mem 256 MB + +# TAG: maximum_object_size_in_memory (bytes) +# Objects greater than this size will not be attempted to kept in +# the memory cache. This should be set high enough to keep objects +# accessed frequently in memory to improve performance whilst low +# enough to keep larger objects from hoarding cache_mem. +#Default: +# maximum_object_size_in_memory 512 KB + +# TAG: memory_replacement_policy +# The memory replacement policy parameter determines which +# objects are purged from memory when memory space is needed. +# +# See cache_replacement_policy for details. +#Default: +# memory_replacement_policy lru + +# DISK CACHE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: cache_replacement_policy +# The cache replacement policy parameter determines which +# objects are evicted (replaced) when disk space is needed. +# +# lru : Squid's original list based LRU policy +# heap GDSF : Greedy-Dual Size Frequency +# heap LFUDA: Least Frequently Used with Dynamic Aging +# heap LRU : LRU policy implemented using a heap +# +# Applies to any cache_dir lines listed below this. +# +# The LRU policies keeps recently referenced objects. +# +# The heap GDSF policy optimizes object hit rate by keeping smaller +# popular objects in cache so it has a better chance of getting a +# hit. It achieves a lower byte hit rate than LFUDA though since +# it evicts larger (possibly popular) objects. +# +# The heap LFUDA policy keeps popular objects in cache regardless of +# their size and thus optimizes byte hit rate at the expense of +# hit rate since one large, popular object will prevent many +# smaller, slightly less popular objects from being cached. +# +# Both policies utilize a dynamic aging mechanism that prevents +# cache pollution that can otherwise occur with frequency-based +# replacement policies. +# +# NOTE: if using the LFUDA replacement policy you should increase +# the value of maximum_object_size above its default of 4096 KB to +# to maximize the potential byte hit rate improvement of LFUDA. +# +# For more information about the GDSF and LFUDA cache replacement +# policies see http://www.hpl.hp.com/techreports/1999/HPL-1999-69.html +# and http://fog.hpl.external.hp.com/techreports/98/HPL-98-173.html. +#Default: +# cache_replacement_policy lru + +# TAG: cache_dir +# Usage: +# +# cache_dir Type Directory-Name Fs-specific-data [options] +# +# You can specify multiple cache_dir lines to spread the +# cache among different disk partitions. +# +# Type specifies the kind of storage system to use. Only "ufs" +# is built by default. To enable any of the other storage systems +# see the --enable-storeio configure option. +# +# 'Directory' is a top-level directory where cache swap +# files will be stored. If you want to use an entire disk +# for caching, this can be the mount-point directory. +# The directory must exist and be writable by the Squid +# process. Squid will NOT create this directory for you. +# +# The ufs store type: +# +# "ufs" is the old well-known Squid storage format that has always +# been there. +# +# cache_dir ufs Directory-Name Mbytes L1 L2 [options] +# +# 'Mbytes' is the amount of disk space (MB) to use under this +# directory. The default is 100 MB. Change this to suit your +# configuration. Do NOT put the size of your disk drive here. +# Instead, if you want Squid to use the entire disk drive, +# subtract 20% and use that value. +# +# 'L1' is the number of first-level subdirectories which +# will be created under the 'Directory'. The default is 16. +# +# 'L2' is the number of second-level subdirectories which +# will be created under each first-level directory. The default +# is 256. +# +# The aufs store type: +# +# "aufs" uses the same storage format as "ufs", utilizing +# POSIX-threads to avoid blocking the main Squid process on +# disk-I/O. This was formerly known in Squid as async-io. +# +# cache_dir aufs Directory-Name Mbytes L1 L2 [options] +# +# see argument descriptions under ufs above +# +# The diskd store type: +# +# "diskd" uses the same storage format as "ufs", utilizing a +# separate process to avoid blocking the main Squid process on +# disk-I/O. +# +# cache_dir diskd Directory-Name Mbytes L1 L2 [options] [Q1=n] [Q2=n] +# +# see argument descriptions under ufs above +# +# Q1 specifies the number of unacknowledged I/O requests when Squid +# stops opening new files. If this many messages are in the queues, +# Squid won't open new files. Default is 64 +# +# Q2 specifies the number of unacknowledged messages when Squid +# starts blocking. If this many messages are in the queues, +# Squid blocks until it receives some replies. Default is 72 +# +# When Q1 < Q2 (the default), the cache directory is optimized +# for lower response time at the expense of a decrease in hit +# ratio. If Q1 > Q2, the cache directory is optimized for +# higher hit ratio at the expense of an increase in response +# time. +# +# The coss store type: +# +# NP: COSS filesystem in Squid-3 has been deemed too unstable for +# production use and has thus been removed from this release. +# We hope that it can be made usable again soon. +# +# block-size=n defines the "block size" for COSS cache_dir's. +# Squid uses file numbers as block numbers. Since file numbers +# are limited to 24 bits, the block size determines the maximum +# size of the COSS partition. The default is 512 bytes, which +# leads to a maximum cache_dir size of 512<<24, or 8 GB. Note +# you should not change the coss block size after Squid +# has written some objects to the cache_dir. +# +# The coss file store has changed from 2.5. Now it uses a file +# called 'stripe' in the directory names in the config - and +# this will be created by squid -z. +# +# Common options: +# +# no-store, no new objects should be stored to this cache_dir +# +# max-size=n, refers to the max object size in bytes this cache_dir +# supports. It is used to select the cache_dir to store the object. +# Note: To make optimal use of the max-size limits you should order +# the cache_dir lines with the smallest max-size value first and the +# ones with no max-size specification last. +# +# Note for coss, max-size must be less than COSS_MEMBUF_SZ, +# which can be changed with the --with-coss-membuf-size=N configure +# option. +# + +# Uncomment and adjust the following to add a disk cache directory. +#cache_dir ufs /var/log/squid/cache 100 16 256 + +# TAG: store_dir_select_algorithm +# Set this to 'round-robin' as an alternative. +#Default: +# store_dir_select_algorithm least-load + +# TAG: max_open_disk_fds +# To avoid having disk as the I/O bottleneck Squid can optionally +# bypass the on-disk cache if more than this amount of disk file +# descriptors are open. +# +# A value of 0 indicates no limit. +#Default: +# max_open_disk_fds 0 + +# TAG: minimum_object_size (bytes) +# Objects smaller than this size will NOT be saved on disk. The +# value is specified in kilobytes, and the default is 0 KB, which +# means there is no minimum. +#Default: +# minimum_object_size 0 KB + +# TAG: maximum_object_size (bytes) +# Objects larger than this size will NOT be saved on disk. The +# value is specified in kilobytes, and the default is 4MB. If +# you wish to get a high BYTES hit ratio, you should probably +# increase this (one 32 MB object hit counts for 3200 10KB +# hits). If you wish to increase speed more than your want to +# save bandwidth you should leave this low. +# +# NOTE: if using the LFUDA replacement policy you should increase +# this value to maximize the byte hit rate improvement of LFUDA! +# See replacement_policy below for a discussion of this policy. +#Default: +# maximum_object_size 4096 KB + +# TAG: cache_swap_low (percent, 0-100) +# TAG: cache_swap_high (percent, 0-100) +# +# The low- and high-water marks for cache object replacement. +# Replacement begins when the swap (disk) usage is above the +# low-water mark and attempts to maintain utilization near the +# low-water mark. As swap utilization gets close to high-water +# mark object eviction becomes more aggressive. If utilization is +# close to the low-water mark less replacement is done each time. +# +# Defaults are 90% and 95%. If you have a large cache, 5% could be +# hundreds of MB. If this is the case you may wish to set these +# numbers closer together. +#Default: +# cache_swap_low 90 +# cache_swap_high 95 + +# LOGFILE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: logformat +# Usage: +# +# logformat <name> <format specification> +# +# Defines an access log format. +# +# The <format specification> is a string with embedded % format codes +# +# % format codes all follow the same basic structure where all but +# the formatcode is optional. Output strings are automatically escaped +# as required according to their context and the output format +# modifiers are usually not needed, but can be specified if an explicit +# output format is desired. +# +# % ["|[|'|#] [-] [[0]width] [{argument}] formatcode +# +# " output in quoted string format +# [ output in squid text log format as used by log_mime_hdrs +# # output in URL quoted format +# ' output as-is +# +# - left aligned +# width field width. If starting with 0 the +# output is zero padded +# {arg} argument such as header name etc +# +# Format codes: +# +# % a literal % character +# >a Client source IP address +# >A Client FQDN +# >p Client source port +# <A Server IP address or peer name +# la Local IP address (http_port) +# lp Local port number (http_port) +# ts Seconds since epoch +# tu subsecond time (milliseconds) +# tl Local time. Optional strftime format argument +# default %d/%b/%Y:%H:%M:%S %z +# tg GMT time. Optional strftime format argument +# default %d/%b/%Y:%H:%M:%S %z +# tr Response time (milliseconds) +# dt Total time spent making DNS lookups (milliseconds) +# +# HTTP cache related format codes: +# +# [http::]>h Original request header. Optional header name argument +# on the format header[:[separator]element] +# [http::]>ha The HTTP request headers after adaptation and redirection. +# Optional header name argument as for >h +# [http::]<h Reply header. Optional header name argument +# as for >h +# [http::]un User name +# [http::]ul User name from authentication +# [http::]ui User name from ident +# [http::]us User name from SSL +# [http::]ue User name from external acl helper +# [http::]>Hs HTTP status code sent to the client +# [http::]<Hs HTTP status code received from the next hop +# [http::]Ss Squid request status (TCP_MISS etc) +# [http::]Sh Squid hierarchy status (DEFAULT_PARENT etc) +# [http::]mt MIME content type +# [http::]rm Request method (GET/POST etc) +# [http::]ru Request URL +# [http::]rp Request URL-Path excluding hostname +# [http::]rv Request protocol version +# [http::]et Tag returned by external acl +# [http::]ea Log string returned by external acl +# [http::]<st Sent reply size including HTTP headers +# [http::]>st Received request size including HTTP headers. In the +# case of chunked requests the chunked encoding metadata +# are not included +# [http::]>sh Received HTTP request headers size +# [http::]<sh Sent HTTP reply headers size +# [http::]st Request+Reply size including HTTP headers +# [http::]<sH Reply high offset sent +# [http::]<sS Upstream object size +# [http::]<pt Peer response time in milliseconds. The timer starts +# when the last request byte is sent to the next hop +# and stops when the last response byte is received. +# [http::]<tt Total server-side time in milliseconds. The timer +# starts with the first connect request (or write I/O) +# sent to the first selected peer. The timer stops +# with the last I/O with the last peer. +# +# If ICAP is enabled, the following two codes become available (as +# well as ICAP log codes documented with the icap_log option): +# +# icap::tt Total ICAP processing time for the HTTP +# transaction. The timer ticks when ICAP +# ACLs are checked and when ICAP +# transaction is in progress. +# +# icap::<last_h The header of the last ICAP response +# related to the HTTP transaction. Like +# <h, accepts an optional header name +# argument. Will not change semantics +# when multiple ICAP transactions per HTTP +# transaction are supported. +# +# If adaptation is enabled the following two codes become available: +# +# adapt::sum_trs Summed adaptation transaction response +# times recorded as a comma-separated list in +# the order of transaction start time. Each time +# value is recorded as an integer number, +# representing response time of one or more +# adaptation (ICAP or eCAP) transaction in +# milliseconds. When a failed transaction is +# being retried or repeated, its time is not +# logged individually but added to the +# replacement (next) transaction. See also: +# adapt::all_trs. +# +# adapt::all_trs All adaptation transaction response times. +# Same as adaptation_strs but response times of +# individual transactions are never added +# together. Instead, all transaction response +# times are recorded individually. +# +# You can prefix adapt::*_trs format codes with adaptation +# service name in curly braces to record response time(s) specific +# to that service. For example: %{my_service}adapt::sum_trs +# +# The default formats available (which do not need re-defining) are: +# +#logformat squid %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt +#logformat squidmime %ts.%03tu %6tr %>a %Ss/%03>Hs %<st %rm %ru %un %Sh/%<A %mt [%>h] [%<h] +#logformat common %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st %Ss:%Sh +#logformat combined %>a %ui %un [%tl] "%rm %ru HTTP/%rv" %>Hs %<st "%{Referer}>h" "%{User-Agent}>h" %Ss:%Sh +#Default: +# none + +# TAG: access_log +# These files log client request activities. Has a line every HTTP or +# ICP request. The format is: +# access_log <filepath> [<logformat name> [acl acl ...]] +# access_log none [acl acl ...]] +# +# Will log to the specified file using the specified format (which +# must be defined in a logformat directive) those entries which match +# ALL the acl's specified (which must be defined in acl clauses). +# If no acl is specified, all requests will be logged to this file. +# +# To disable logging of a request use the filepath "none", in which case +# a logformat name should not be specified. +# +# To log the request via syslog specify a filepath of "syslog": +# +# access_log syslog[:facility.priority] [format [acl1 [acl2 ....]]] +# where facility could be any of: +# authpriv, daemon, local0 .. local7 or user. +# +# And priority could be any of: +# err, warning, notice, info, debug. +# +# Default: +# access_log /var/log/squid/access.log squid +#Default: +# access_log /var/log/squid/access.log squid + +# TAG: icap_log +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# ICAP log files record ICAP transaction summaries, one line per +# transaction. +# +# The icap_log option format is: +# icap_log <filepath> [<logformat name> [acl acl ...]] +# icap_log none [acl acl ...]] +# +# Please see access_log option documentation for details. The two +# kinds of logs share the overall configuration approach and many +# features. +# +# ICAP processing of a single HTTP message or transaction may +# require multiple ICAP transactions. In such cases, multiple +# ICAP transaction log lines will correspond to a single access +# log line. +# +# ICAP log uses logformat codes that make sense for an ICAP +# transaction. Header-related codes are applied to the HTTP header +# embedded in an ICAP server response, with the following caveats: +# For REQMOD, there is no HTTP response header unless the ICAP +# server performed request satisfaction. For RESPMOD, the HTTP +# request header is the header sent to the ICAP server. For +# OPTIONS, there are no HTTP headers. +# +# The following format codes are also available for ICAP logs: +# +# icap::<A ICAP server IP address. Similar to <A. +# +# icap::<service_name ICAP service name from the icap_service +# option in Squid configuration file. +# +# icap::ru ICAP Request-URI. Similar to ru. +# +# icap::rm ICAP request method (REQMOD, RESPMOD, or +# OPTIONS). Similar to existing rm. +# +# icap::>st Bytes sent to the ICAP server (TCP payload +# only; i.e., what Squid writes to the socket). +# +# icap::<st Bytes received from the ICAP server (TCP +# payload only; i.e., what Squid reads from +# the socket). +# +# icap::tr Transaction response time (in +# milliseconds). The timer starts when +# the ICAP transaction is created and +# stops when the transaction is completed. +# Similar to tr. +# +# icap::tio Transaction I/O time (in milliseconds). The +# timer starts when the first ICAP request +# byte is scheduled for sending. The timers +# stops when the last byte of the ICAP response +# is received. +# +# icap::to Transaction outcome: ICAP_ERR* for all +# transaction errors, ICAP_OPT for OPTION +# transactions, ICAP_ECHO for 204 +# responses, ICAP_MOD for message +# modification, and ICAP_SAT for request +# satisfaction. Similar to Ss. +# +# icap::Hs ICAP response status code. Similar to Hs. +# +# icap::>h ICAP request header(s). Similar to >h. +# +# icap::<h ICAP response header(s). Similar to <h. +# +# The default ICAP log format, which can be used without an explicit +# definition, is called icap_squid: +# +#logformat icap_squid %ts.%03tu %6icap::tr %>a %icap::to/%03icap::Hs %icap::<size %icap::rm %icap::ru% %un -/%icap::<A - +# +# See also: logformat, log_icap, and %icap::<last_h +#Default: +# none + +# TAG: log_access allow|deny acl acl... +# This options allows you to control which requests gets logged +# to access.log (see access_log directive). Requests denied for +# logging will also not be accounted for in performance counters. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: log_icap +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This options allows you to control which requests get logged +# to icap.log. See the icap_log directive for ICAP log details. +#Default: +# none + +# TAG: cache_store_log +# Logs the activities of the storage manager. Shows which +# objects are ejected from the cache, and which objects are +# saved and for how long. To disable, enter "none" or remove the line. +# There are not really utilities to analyze this data, so you can safely +# disable it. +# +# Example: +# cache_store_log /var/log/squid/store.log +#Default: +# none + +# TAG: cache_swap_state +# Location for the cache "swap.state" file. This index file holds +# the metadata of objects saved on disk. It is used to rebuild +# the cache during startup. Normally this file resides in each +# 'cache_dir' directory, but you may specify an alternate +# pathname here. Note you must give a full filename, not just +# a directory. Since this is the index for the whole object +# list you CANNOT periodically rotate it! +# +# If %s can be used in the file name it will be replaced with a +# a representation of the cache_dir name where each / is replaced +# with '.'. This is needed to allow adding/removing cache_dir +# lines when cache_swap_log is being used. +# +# If have more than one 'cache_dir', and %s is not used in the name +# these swap logs will have names such as: +# +# cache_swap_log.00 +# cache_swap_log.01 +# cache_swap_log.02 +# +# The numbered extension (which is added automatically) +# corresponds to the order of the 'cache_dir' lines in this +# configuration file. If you change the order of the 'cache_dir' +# lines in this file, these index files will NOT correspond to +# the correct 'cache_dir' entry (unless you manually rename +# them). We recommend you do NOT use this option. It is +# better to keep these index files in each 'cache_dir' directory. +#Default: +# none + +# TAG: logfile_rotate +# Specifies the number of logfile rotations to make when you +# type 'squid -k rotate'. The default is 10, which will rotate +# with extensions 0 through 9. Setting logfile_rotate to 0 will +# disable the file name rotation, but the logfiles are still closed +# and re-opened. This will enable you to rename the logfiles +# yourself just before sending the rotate signal. +# +# Note, the 'squid -k rotate' command normally sends a USR1 +# signal to the running squid process. In certain situations +# (e.g. on Linux with Async I/O), USR1 is used for other +# purposes, so -k rotate uses another signal. It is best to get +# in the habit of using 'squid -k rotate' instead of 'kill -USR1 +# <pid>'. +# +# Note, from Squid-3.1 this option has no effect on the cache.log, +# that log can be rotated separately by using debug_options +#Default: +# logfile_rotate 10 + +# TAG: emulate_httpd_log on|off +# The Cache can emulate the log file format which many 'httpd' +# programs use. To disable/enable this emulation, set +# emulate_httpd_log to 'off' or 'on'. The default +# is to use the native log format since it includes useful +# information Squid-specific log analyzers use. +#Default: +# emulate_httpd_log off + +# TAG: log_ip_on_direct on|off +# Log the destination IP address in the hierarchy log tag when going +# direct. Earlier Squid versions logged the hostname here. If you +# prefer the old way set this to off. +#Default: +# log_ip_on_direct on + +# TAG: mime_table +# Pathname to Squid's MIME table. You shouldn't need to change +# this, but the default file contains examples and formatting +# information if you do. +#Default: +# mime_table /etc/squid/mime.conf + +# TAG: log_mime_hdrs on|off +# The Cache can record both the request and the response MIME +# headers for each HTTP transaction. The headers are encoded +# safely and will appear as two bracketed fields at the end of +# the access log (for either the native or httpd-emulated log +# formats). To enable this logging set log_mime_hdrs to 'on'. +#Default: +# log_mime_hdrs off + +# TAG: useragent_log +# Note: This option is only available if Squid is rebuilt with the +# --enable-useragent-log option +# +# Squid will write the User-Agent field from HTTP requests +# to the filename specified here. By default useragent_log +# is disabled. +#Default: +# none + +# TAG: referer_log +# Note: This option is only available if Squid is rebuilt with the +# --enable-referer-log option +# +# Squid will write the Referer field from HTTP requests to the +# filename specified here. By default referer_log is disabled. +# Note that "referer" is actually a misspelling of "referrer" +# however the misspelt version has been accepted into the HTTP RFCs +# and we accept both. +#Default: +# none + +# TAG: pid_filename +# A filename to write the process-id to. To disable, enter "none". +#Default: +# pid_filename /var/run/squid + +# TAG: log_fqdn on|off +# Turn this on if you wish to log fully qualified domain names +# in the access.log. To do this Squid does a DNS lookup of all +# IP's connecting to it. This can (in some situations) increase +# latency, which makes your cache seem slower for interactive +# browsing. +#Default: +# log_fqdn off + +# TAG: client_netmask +# A netmask for client addresses in logfiles and cachemgr output. +# Change this to protect the privacy of your cache clients. +# A netmask of 255.255.255.0 will log all IP's in that range with +# the last digit set to '0'. +#Default: +# client_netmask no_addr + +# TAG: forward_log +# Note: This option is only available if Squid is rebuilt with the +# -DWIP_FWD_LOG define +# +# Logs the server-side requests. +# +# This is currently work in progress. +#Default: +# none + +# TAG: strip_query_terms +# By default, Squid strips query terms from requested URLs before +# logging. This protects your user's privacy. +#Default: +# strip_query_terms on + +# TAG: buffered_logs on|off +# cache.log log file is written with stdio functions, and as such +# it can be buffered or unbuffered. By default it will be unbuffered. +# Buffering it can speed up the writing slightly (though you are +# unlikely to need to worry unless you run with tons of debugging +# enabled in which case performance will suffer badly anyway..). +#Default: +# buffered_logs off + +# TAG: netdb_filename +# Note: This option is only available if Squid is rebuilt with the +# --enable-icmp option +# +# A filename where Squid stores it's netdb state between restarts. +# To disable, enter "none". +#Default: +# netdb_filename /var/log/squid/netdb.state + +# OPTIONS FOR TROUBLESHOOTING +# ----------------------------------------------------------------------------- + +# TAG: cache_log +# Cache logging file. This is where general information about +# your cache's behavior goes. You can increase the amount of data +# logged to this file and how often its rotated with "debug_options" +#Default: +# cache_log /var/log/squid/cache.log + +# TAG: debug_options +# Logging options are set as section,level where each source file +# is assigned a unique section. Lower levels result in less +# output, Full debugging (level 9) can result in a very large +# log file, so be careful. +# +# The magic word "ALL" sets debugging levels for all sections. +# We recommend normally running with "ALL,1". +# +# The rotate=N option can be used to keep more or less of these logs +# than would otherwise be kept by logfile_rotate. +# For most uses a single log should be enough to monitor current +# events affecting Squid. +#Default: +# debug_options ALL,1 + +# TAG: coredump_dir +# By default Squid leaves core files in the directory from where +# it was started. If you set 'coredump_dir' to a directory +# that exists, Squid will chdir() to that directory at startup +# and coredump files will be left there. +# +#Default: +# coredump_dir none +# + +# Leave coredumps in the first cache dir +coredump_dir /var/log/squid/cache + +# OPTIONS FOR FTP GATEWAYING +# ----------------------------------------------------------------------------- + +# TAG: ftp_user +# If you want the anonymous login password to be more informative +# (and enable the use of picky ftp servers), set this to something +# reasonable for your domain, like wwwuser@somewhere.net +# +# The reason why this is domainless by default is the +# request can be made on the behalf of a user in any domain, +# depending on how the cache is used. +# Some ftp server also validate the email address is valid +# (for example perl.com). +#Default: +# ftp_user Squid@ + +# TAG: ftp_list_width +# Sets the width of ftp listings. This should be set to fit in +# the width of a standard browser. Setting this too small +# can cut off long filenames when browsing ftp sites. +#Default: +# ftp_list_width 32 + +# TAG: ftp_passive +# If your firewall does not allow Squid to use passive +# connections, turn off this option. +# +# Use of ftp_epsv_all option requires this to be ON. +#Default: +# ftp_passive on + +# TAG: ftp_epsv_all +# FTP Protocol extensions permit the use of a special "EPSV ALL" command. +# +# NATs may be able to put the connection on a "fast path" through the +# translator, as the EPRT command will never be used and therefore, +# translation of the data portion of the segments will never be needed. +# +# When a client only expects to do two-way FTP transfers this may be +# useful. +# If squid finds that it must do a three-way FTP transfer after issuing +# an EPSV ALL command, the FTP session will fail. +# +# If you have any doubts about this option do not use it. +# Squid will nicely attempt all other connection methods. +# +# Requires ftp_passive to be ON (default) for any effect. +#Default: +# ftp_epsv_all off + +# TAG: ftp_epsv +# FTP Protocol extensions permit the use of a special "EPSV" command. +# +# NATs may be able to put the connection on a "fast path" through the +# translator using EPSV, as the EPRT command will never be used +# and therefore, translation of the data portion of the segments +# will never be needed. +# +# Turning this OFF will prevent EPSV being attempted. +# WARNING: Doing so will convert Squid back to the old behavior with all +# the related problems with external NAT devices/layers. +# +# Requires ftp_passive to be ON (default) for any effect. +#Default: +# ftp_epsv on + +# TAG: ftp_eprt +# FTP Protocol extensions permit the use of a special "EPRT" command. +# +# This extension provides a protocol neutral alternative to the +# IPv4-only PORT command. When supported it enables active FTP data +# channels over IPv6 and efficient NAT handling. +# +# Turning this OFF will prevent EPRT being attempted and will skip +# straight to using PORT for IPv4 servers. +# +# Some devices are known to not handle this extension correctly and +# may result in crashes. Devices which suport EPRT enough to fail +# cleanly will result in Squid attempting PORT anyway. This directive +# should only be disabled when EPRT results in device failures. +# +# WARNING: Doing so will convert Squid back to the old behavior with all +# the related problems with external NAT devices/layers and IPv4-only FTP. +#Default: +# ftp_eprt on + +# TAG: ftp_sanitycheck +# For security and data integrity reasons Squid by default performs +# sanity checks of the addresses of FTP data connections ensure the +# data connection is to the requested server. If you need to allow +# FTP connections to servers using another IP address for the data +# connection turn this off. +#Default: +# ftp_sanitycheck on + +# TAG: ftp_telnet_protocol +# The FTP protocol is officially defined to use the telnet protocol +# as transport channel for the control connection. However, many +# implementations are broken and does not respect this aspect of +# the FTP protocol. +# +# If you have trouble accessing files with ASCII code 255 in the +# path or similar problems involving this ASCII code you can +# try setting this directive to off. If that helps, report to the +# operator of the FTP server in question that their FTP server +# is broken and does not follow the FTP standard. +#Default: +# ftp_telnet_protocol on + +# OPTIONS FOR EXTERNAL SUPPORT PROGRAMS +# ----------------------------------------------------------------------------- + +# TAG: diskd_program +# Specify the location of the diskd executable. +# Note this is only useful if you have compiled in +# diskd as one of the store io modules. +#Default: +# diskd_program /usr/libexec/diskd + +# TAG: unlinkd_program +# Specify the location of the executable for file deletion process. +#Default: +# unlinkd_program /usr/libexec/unlinkd + +# TAG: pinger_program +# Note: This option is only available if Squid is rebuilt with the +# --enable-icmp option +# +# Specify the location of the executable for the pinger process. +#Default: +# pinger_program /usr/libexec/pinger + +# TAG: pinger_enable +# Note: This option is only available if Squid is rebuilt with the +# --enable-icmp option +# +# Control whether the pinger is active at run-time. +# Enables turning ICMP pinger on and off with a simple +# squid -k reconfigure. +#Default: +# pinger_enable off + +# OPTIONS FOR URL REWRITING +# ----------------------------------------------------------------------------- + +# TAG: url_rewrite_program +# Specify the location of the executable for the URL rewriter. +# Since they can perform almost any function there isn't one included. +# +# For each requested URL rewriter will receive on line with the format +# +# URL <SP> client_ip "/" fqdn <SP> user <SP> method [<SP> kvpairs]<NL> +# +# In the future, the rewriter interface will be extended with +# key=value pairs ("kvpairs" shown above). Rewriter programs +# should be prepared to receive and possibly ignore additional +# whitespace-separated tokens on each input line. +# +# And the rewriter may return a rewritten URL. The other components of +# the request line does not need to be returned (ignored if they are). +# +# The rewriter can also indicate that a client-side redirect should +# be performed to the new URL. This is done by prefixing the returned +# URL with "301:" (moved permanently) or 302: (moved temporarily). +# +# By default, a URL rewriter is not used. +#Default: +# none + +# TAG: url_rewrite_children +# The number of redirector processes to spawn. If you start +# too few Squid will have to wait for them to process a backlog of +# URLs, slowing it down. If you start too many they will use RAM +# and other system resources. +#Default: +# url_rewrite_children 5 + +# TAG: url_rewrite_concurrency +# The number of requests each redirector helper can handle in +# parallel. Defaults to 0 which indicates the redirector +# is a old-style single threaded redirector. +# +# When this directive is set to a value >= 1 then the protocol +# used to communicate with the helper is modified to include +# a request ID in front of the request/response. The request +# ID from the request must be echoed back with the response +# to that request. +#Default: +# url_rewrite_concurrency 0 + +# TAG: url_rewrite_host_header +# By default Squid rewrites any Host: header in redirected +# requests. If you are running an accelerator this may +# not be a wanted effect of a redirector. +# +# WARNING: Entries are cached on the result of the URL rewriting +# process, so be careful if you have domain-virtual hosts. +#Default: +# url_rewrite_host_header on + +# TAG: url_rewrite_access +# If defined, this access list specifies which requests are +# sent to the redirector processes. By default all requests +# are sent. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: url_rewrite_bypass +# When this is 'on', a request will not go through the +# redirector if all redirectors are busy. If this is 'off' +# and the redirector queue grows too large, Squid will exit +# with a FATAL error and ask you to increase the number of +# redirectors. You should only enable this if the redirectors +# are not critical to your caching system. If you use +# redirectors for access control, and you enable this option, +# users may have access to pages they should not +# be allowed to request. +#Default: +# url_rewrite_bypass off + +# OPTIONS FOR TUNING THE CACHE +# ----------------------------------------------------------------------------- + +# TAG: cache +# A list of ACL elements which, if matched and denied, cause the request to +# not be satisfied from the cache and the reply to not be cached. +# In other words, use this to force certain objects to never be cached. +# +# You must use the words 'allow' or 'deny' to indicate whether items +# matching the ACL should be allowed or denied into the cache. +# +# Default is to allow all to be cached. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: refresh_pattern +# usage: refresh_pattern [-i] regex min percent max [options] +# +# By default, regular expressions are CASE-SENSITIVE. To make +# them case-insensitive, use the -i option. +# +# 'Min' is the time (in minutes) an object without an explicit +# expiry time should be considered fresh. The recommended +# value is 0, any higher values may cause dynamic applications +# to be erroneously cached unless the application designer +# has taken the appropriate actions. +# +# 'Percent' is a percentage of the objects age (time since last +# modification age) an object without explicit expiry time +# will be considered fresh. +# +# 'Max' is an upper limit on how long objects without an explicit +# expiry time will be considered fresh. +# +# options: override-expire +# override-lastmod +# reload-into-ims +# ignore-reload +# ignore-no-cache +# ignore-no-store +# ignore-must-revalidate +# ignore-private +# ignore-auth +# refresh-ims +# +# override-expire enforces min age even if the server +# sent an explicit expiry time (e.g., with the +# Expires: header or Cache-Control: max-age). Doing this +# VIOLATES the HTTP standard. Enabling this feature +# could make you liable for problems which it causes. +# +# Note: override-expire does not enforce staleness - it only extends +# freshness / min. If the server returns a Expires time which +# is longer than your max time, Squid will still consider +# the object fresh for that period of time. +# +# override-lastmod enforces min age even on objects +# that were modified recently. +# +# reload-into-ims changes client no-cache or ``reload'' +# to If-Modified-Since requests. Doing this VIOLATES the +# HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-reload ignores a client no-cache or ``reload'' +# header. Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which +# it causes. +# +# ignore-no-cache ignores any ``Pragma: no-cache'' and +# ``Cache-control: no-cache'' headers received from a server. +# The HTTP RFC never allows the use of this (Pragma) header +# from a server, only a client, though plenty of servers +# send it anyway. +# +# ignore-no-store ignores any ``Cache-control: no-store'' +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-must-revalidate ignores any ``Cache-Control: must-revalidate`` +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-private ignores any ``Cache-control: private'' +# headers received from a server. Doing this VIOLATES +# the HTTP standard. Enabling this feature could make you +# liable for problems which it causes. +# +# ignore-auth caches responses to requests with authorization, +# as if the originserver had sent ``Cache-control: public'' +# in the response header. Doing this VIOLATES the HTTP standard. +# Enabling this feature could make you liable for problems which +# it causes. +# +# refresh-ims causes squid to contact the origin server +# when a client issues an If-Modified-Since request. This +# ensures that the client will receive an updated version +# if one is available. +# +# Basically a cached object is: +# +# FRESH if expires < now, else STALE +# STALE if age > max +# FRESH if lm-factor < percent, else STALE +# FRESH if age < min +# else STALE +# +# The refresh_pattern lines are checked in the order listed here. +# The first entry which matches is used. If none of the entries +# match the default will be used. +# +# Note, you must uncomment all the default lines if you want +# to change one. The default setting is only active if none is +# used. +# +# + +# Add any of your own refresh_pattern entries above these. +refresh_pattern ^ftp: 1440 20% 10080 +refresh_pattern ^gopher: 1440 0% 1440 +refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 +refresh_pattern . 0 20% 4320 + +# TAG: quick_abort_min (KB) +# TAG: quick_abort_max (KB) +# TAG: quick_abort_pct (percent) +# The cache by default continues downloading aborted requests +# which are almost completed (less than 16 KB remaining). This +# may be undesirable on slow (e.g. SLIP) links and/or very busy +# caches. Impatient users may tie up file descriptors and +# bandwidth by repeatedly requesting and immediately aborting +# downloads. +# +# When the user aborts a request, Squid will check the +# quick_abort values to the amount of data transfered until +# then. +# +# If the transfer has less than 'quick_abort_min' KB remaining, +# it will finish the retrieval. +# +# If the transfer has more than 'quick_abort_max' KB remaining, +# it will abort the retrieval. +# +# If more than 'quick_abort_pct' of the transfer has completed, +# it will finish the retrieval. +# +# If you do not want any retrieval to continue after the client +# has aborted, set both 'quick_abort_min' and 'quick_abort_max' +# to '0 KB'. +# +# If you want retrievals to always continue if they are being +# cached set 'quick_abort_min' to '-1 KB'. +#Default: +# quick_abort_min 16 KB +# quick_abort_max 16 KB +# quick_abort_pct 95 + +# TAG: read_ahead_gap buffer-size +# The amount of data the cache will buffer ahead of what has been +# sent to the client when retrieving an object from another server. +#Default: +# read_ahead_gap 16 KB + +# TAG: negative_ttl time-units +# Set the Default Time-to-Live (TTL) for failed requests. +# Certain types of failures (such as "connection refused" and +# "404 Not Found") are able to be negatively-cached for a short time. +# Modern web servers should provide Expires: header, however if they +# do not this can provide a minimum TTL. +# The default is not to cache errors with unknown expiry details. +# +# Note that this is different from negative caching of DNS lookups. +# +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. +#Default: +# negative_ttl 0 seconds + +# TAG: positive_dns_ttl time-units +# Upper limit on how long Squid will cache positive DNS responses. +# Default is 6 hours (360 minutes). This directive must be set +# larger than negative_dns_ttl. +#Default: +# positive_dns_ttl 6 hours + +# TAG: negative_dns_ttl time-units +# Time-to-Live (TTL) for negative caching of failed DNS lookups. +# This also sets the lower cache limit on positive lookups. +# Minimum value is 1 second, and it is not recommendable to go +# much below 10 seconds. +#Default: +# negative_dns_ttl 1 minutes + +# TAG: range_offset_limit (bytes) +# Sets a upper limit on how far into the the file a Range request +# may be to cause Squid to prefetch the whole file. If beyond this +# limit Squid forwards the Range request as it is and the result +# is NOT cached. +# +# This is to stop a far ahead range request (lets say start at 17MB) +# from making Squid fetch the whole object up to that point before +# sending anything to the client. +# +# A value of 0 causes Squid to never fetch more than the +# client requested. (default) +# +# A value of -1 causes Squid to always fetch the object from the +# beginning so it may cache the result. (2.0 style) +# +# NP: Using -1 here will override any quick_abort settings that may +# otherwise apply to the range request. The range request will +# be fully fetched from start to finish regardless of the client +# actions. This affects bandwidth usage. +#Default: +# range_offset_limit 0 KB + +# TAG: minimum_expiry_time (seconds) +# The minimum caching time according to (Expires - Date) +# Headers Squid honors if the object can't be revalidated +# defaults to 60 seconds. In reverse proxy environments it +# might be desirable to honor shorter object lifetimes. It +# is most likely better to make your server return a +# meaningful Last-Modified header however. In ESI environments +# where page fragments often have short lifetimes, this will +# often be best set to 0. +#Default: +# minimum_expiry_time 60 seconds + +# TAG: store_avg_object_size (kbytes) +# Average object size, used to estimate number of objects your +# cache can hold. The default is 13 KB. +#Default: +# store_avg_object_size 13 KB + +# TAG: store_objects_per_bucket +# Target number of objects per bucket in the store hash table. +# Lowering this value increases the total number of buckets and +# also the storage maintenance rate. The default is 20. +#Default: +# store_objects_per_bucket 20 + +# HTTP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: request_header_max_size (KB) +# This specifies the maximum size for HTTP headers in a request. +# Request headers are usually relatively small (about 512 bytes). +# Placing a limit on the request header size will catch certain +# bugs (for example with persistent connections) and possibly +# buffer-overflow or denial-of-service attacks. +#Default: +# request_header_max_size 64 KB + +# TAG: reply_header_max_size (KB) +# This specifies the maximum size for HTTP headers in a reply. +# Reply headers are usually relatively small (about 512 bytes). +# Placing a limit on the reply header size will catch certain +# bugs (for example with persistent connections) and possibly +# buffer-overflow or denial-of-service attacks. +#Default: +# reply_header_max_size 64 KB + +# TAG: request_body_max_size (bytes) +# This specifies the maximum size for an HTTP request body. +# In other words, the maximum size of a PUT/POST request. +# A user who attempts to send a request with a body larger +# than this limit receives an "Invalid Request" error message. +# If you set this parameter to a zero (the default), there will +# be no limit imposed. +#Default: +# request_body_max_size 0 KB + +# TAG: client_request_buffer_max_size (bytes) +# This specifies the maximum buffer size of a client request. +# It prevents squid eating too much memory when somebody uploads +# a large file. +#Default: +# client_request_buffer_max_size 512 KB + +# TAG: chunked_request_body_max_size (bytes) +# A broken or confused HTTP/1.1 client may send a chunked HTTP +# request to Squid. Squid does not have full support for that +# feature yet. To cope with such requests, Squid buffers the +# entire request and then dechunks request body to create a +# plain HTTP/1.0 request with a known content length. The plain +# request is then used by the rest of Squid code as usual. +# +# The option value specifies the maximum size of the buffer used +# to hold the request before the conversion. If the chunked +# request size exceeds the specified limit, the conversion +# fails, and the client receives an "unsupported request" error, +# as if dechunking was disabled. +# +# Dechunking is enabled by default. To disable conversion of +# chunked requests, set the maximum to zero. +# +# Request dechunking feature and this option in particular are a +# temporary hack. When chunking requests and responses are fully +# supported, there will be no need to buffer a chunked request. +#Default: +# chunked_request_body_max_size 64 KB + +# TAG: broken_posts +# A list of ACL elements which, if matched, causes Squid to send +# an extra CRLF pair after the body of a PUT/POST request. +# +# Some HTTP servers has broken implementations of PUT/POST, +# and rely on an extra CRLF pair sent by some WWW clients. +# +# Quote from RFC2616 section 4.1 on this matter: +# +# Note: certain buggy HTTP/1.0 client implementations generate an +# extra CRLF's after a POST request. To restate what is explicitly +# forbidden by the BNF, an HTTP/1.1 client must not preface or follow +# a request with an extra CRLF. +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +# +#Example: +# acl buggy_server url_regex ^http://.... +# broken_posts allow buggy_server +#Default: +# none + +# TAG: icap_uses_indirect_client on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-follow-x-forwarded-for and --enable-icap-client option +# +# Controls whether the indirect client address +# (see follow_x_forwarded_for) instead of the +# direct client address is passed to an ICAP +# server as "X-Client-IP". +#Default: +# icap_uses_indirect_client on + +# TAG: via on|off +# If set (default), Squid will include a Via header in requests and +# replies as required by RFC2616. +#Default: +# via on + +# TAG: ie_refresh on|off +# Microsoft Internet Explorer up until version 5.5 Service +# Pack 1 has an issue with transparent proxies, wherein it +# is impossible to force a refresh. Turning this on provides +# a partial fix to the problem, by causing all IMS-REFRESH +# requests from older IE versions to check the origin server +# for fresh content. This reduces hit ratio by some amount +# (~10% in my experience), but allows users to actually get +# fresh content when they want it. Note because Squid +# cannot tell if the user is using 5.5 or 5.5SP1, the behavior +# of 5.5 is unchanged from old versions of Squid (i.e. a +# forced refresh is impossible). Newer versions of IE will, +# hopefully, continue to have the new behavior and will be +# handled based on that assumption. This option defaults to +# the old Squid behavior, which is better for hit ratios but +# worse for clients using IE, if they need to be able to +# force fresh content. +#Default: +# ie_refresh off + +# TAG: vary_ignore_expire on|off +# Many HTTP servers supporting Vary gives such objects +# immediate expiry time with no cache-control header +# when requested by a HTTP/1.0 client. This option +# enables Squid to ignore such expiry times until +# HTTP/1.1 is fully implemented. +# +# WARNING: If turned on this may eventually cause some +# varying objects not intended for caching to get cached. +#Default: +# vary_ignore_expire off + +# TAG: request_entities +# Squid defaults to deny GET and HEAD requests with request entities, +# as the meaning of such requests are undefined in the HTTP standard +# even if not explicitly forbidden. +# +# Set this directive to on if you have clients which insists +# on sending request entities in GET or HEAD requests. But be warned +# that there is server software (both proxies and web servers) which +# can fail to properly process this kind of request which may make you +# vulnerable to cache pollution attacks if enabled. +#Default: +# request_entities off + +# TAG: request_header_access +# Usage: request_header_access header_name allow|deny [!]aclname ... +# +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. +# +# This option replaces the old 'anonymize_headers' and the +# older 'http_anonymizer' option with something that is much +# more configurable. This new method creates a list of ACLs +# for each header, allowing you very fine-tuned header +# mangling. +# +# This option only applies to request headers, i.e., from the +# client to the server. +# +# You can only specify known headers for the header name. +# Other headers are reclassified as 'Other'. You can also +# refer to all the headers with 'All'. +# +# For example, to achieve the same behavior as the old +# 'http_anonymizer standard' option, you should use: +# +# request_header_access From deny all +# request_header_access Referer deny all +# request_header_access Server deny all +# request_header_access User-Agent deny all +# request_header_access WWW-Authenticate deny all +# request_header_access Link deny all +# +# Or, to reproduce the old 'http_anonymizer paranoid' feature +# you should use: +# +# request_header_access Allow allow all +# request_header_access Authorization allow all +# request_header_access WWW-Authenticate allow all +# request_header_access Proxy-Authorization allow all +# request_header_access Proxy-Authenticate allow all +# request_header_access Cache-Control allow all +# request_header_access Content-Encoding allow all +# request_header_access Content-Length allow all +# request_header_access Content-Type allow all +# request_header_access Date allow all +# request_header_access Expires allow all +# request_header_access Host allow all +# request_header_access If-Modified-Since allow all +# request_header_access Last-Modified allow all +# request_header_access Location allow all +# request_header_access Pragma allow all +# request_header_access Accept allow all +# request_header_access Accept-Charset allow all +# request_header_access Accept-Encoding allow all +# request_header_access Accept-Language allow all +# request_header_access Content-Language allow all +# request_header_access Mime-Version allow all +# request_header_access Retry-After allow all +# request_header_access Title allow all +# request_header_access Connection allow all +# request_header_access All deny all +# +# although many of those are HTTP reply headers, and so should be +# controlled with the reply_header_access directive. +# +# By default, all headers are allowed (no anonymizing is +# performed). +#Default: +# none + +# TAG: reply_header_access +# Usage: reply_header_access header_name allow|deny [!]aclname ... +# +# WARNING: Doing this VIOLATES the HTTP standard. Enabling +# this feature could make you liable for problems which it +# causes. +# +# This option only applies to reply headers, i.e., from the +# server to the client. +# +# This is the same as request_header_access, but in the other +# direction. +# +# This option replaces the old 'anonymize_headers' and the +# older 'http_anonymizer' option with something that is much +# more configurable. This new method creates a list of ACLs +# for each header, allowing you very fine-tuned header +# mangling. +# +# You can only specify known headers for the header name. +# Other headers are reclassified as 'Other'. You can also +# refer to all the headers with 'All'. +# +# For example, to achieve the same behavior as the old +# 'http_anonymizer standard' option, you should use: +# +# reply_header_access From deny all +# reply_header_access Referer deny all +# reply_header_access Server deny all +# reply_header_access User-Agent deny all +# reply_header_access WWW-Authenticate deny all +# reply_header_access Link deny all +# +# Or, to reproduce the old 'http_anonymizer paranoid' feature +# you should use: +# +# reply_header_access Allow allow all +# reply_header_access Authorization allow all +# reply_header_access WWW-Authenticate allow all +# reply_header_access Proxy-Authorization allow all +# reply_header_access Proxy-Authenticate allow all +# reply_header_access Cache-Control allow all +# reply_header_access Content-Encoding allow all +# reply_header_access Content-Length allow all +# reply_header_access Content-Type allow all +# reply_header_access Date allow all +# reply_header_access Expires allow all +# reply_header_access Host allow all +# reply_header_access If-Modified-Since allow all +# reply_header_access Last-Modified allow all +# reply_header_access Location allow all +# reply_header_access Pragma allow all +# reply_header_access Accept allow all +# reply_header_access Accept-Charset allow all +# reply_header_access Accept-Encoding allow all +# reply_header_access Accept-Language allow all +# reply_header_access Content-Language allow all +# reply_header_access Mime-Version allow all +# reply_header_access Retry-After allow all +# reply_header_access Title allow all +# reply_header_access Connection allow all +# reply_header_access All deny all +# +# although the HTTP request headers won't be usefully controlled +# by this directive -- see request_header_access for details. +# +# By default, all headers are allowed (no anonymizing is +# performed). +#Default: +# none + +# TAG: request_header_replace +# Usage: request_header_replace header_name message +# Example: request_header_replace User-Agent Nutscrape/1.0 (CP/M; 8-bit) +# +# This option allows you to change the contents of headers +# denied with request_header_access above, by replacing them +# with some fixed string. This replaces the old fake_user_agent +# option. +# +# This only applies to request headers, not reply headers. +# +# By default, headers are removed if denied. +#Default: +# none + +# TAG: reply_header_replace +# Usage: reply_header_replace header_name message +# Example: reply_header_replace Server Foo/1.0 +# +# This option allows you to change the contents of headers +# denied with reply_header_access above, by replacing them +# with some fixed string. +# +# This only applies to reply headers, not request headers. +# +# By default, headers are removed if denied. +#Default: +# none + +# TAG: relaxed_header_parser on|off|warn +# In the default "on" setting Squid accepts certain forms +# of non-compliant HTTP messages where it is unambiguous +# what the sending application intended even if the message +# is not correctly formatted. The messages is then normalized +# to the correct form when forwarded by Squid. +# +# If set to "warn" then a warning will be emitted in cache.log +# each time such HTTP error is encountered. +# +# If set to "off" then such HTTP errors will cause the request +# or response to be rejected. +#Default: +# relaxed_header_parser on + +# TAG: ignore_expect_100 on|off +# This option makes Squid ignore any Expect: 100-continue header present +# in the request. RFC 2616 requires that Squid being unable to satisfy +# the response expectation MUST return a 417 error. +# +# Note: Enabling this is a HTTP protocol violation, but some clients may +# not handle it well.. +#Default: +# ignore_expect_100 off + +# TIMEOUTS +# ----------------------------------------------------------------------------- + +# TAG: forward_timeout time-units +# This parameter specifies how long Squid should at most attempt in +# finding a forwarding path for the request before giving up. +#Default: +# forward_timeout 4 minutes + +# TAG: connect_timeout time-units +# This parameter specifies how long to wait for the TCP connect to +# the requested server or peer to complete before Squid should +# attempt to find another path where to forward the request. +#Default: +# connect_timeout 1 minute + +# TAG: peer_connect_timeout time-units +# This parameter specifies how long to wait for a pending TCP +# connection to a peer cache. The default is 30 seconds. You +# may also set different timeout values for individual neighbors +# with the 'connect-timeout' option on a 'cache_peer' line. +#Default: +# peer_connect_timeout 30 seconds + +# TAG: read_timeout time-units +# The read_timeout is applied on server-side connections. After +# each successful read(), the timeout will be extended by this +# amount. If no data is read again after this amount of time, +# the request is aborted and logged with ERR_READ_TIMEOUT. The +# default is 15 minutes. +#Default: +# read_timeout 15 minutes + +# TAG: request_timeout +# How long to wait for an HTTP request after initial +# connection establishment. +#Default: +# request_timeout 5 minutes + +# TAG: persistent_request_timeout +# How long to wait for the next HTTP request on a persistent +# connection after the previous request completes. +#Default: +# persistent_request_timeout 2 minutes + +# TAG: client_lifetime time-units +# The maximum amount of time a client (browser) is allowed to +# remain connected to the cache process. This protects the Cache +# from having a lot of sockets (and hence file descriptors) tied up +# in a CLOSE_WAIT state from remote clients that go away without +# properly shutting down (either because of a network failure or +# because of a poor client implementation). The default is one +# day, 1440 minutes. +# +# NOTE: The default value is intended to be much larger than any +# client would ever need to be connected to your cache. You +# should probably change client_lifetime only as a last resort. +# If you seem to have many client connections tying up +# filedescriptors, we recommend first tuning the read_timeout, +# request_timeout, persistent_request_timeout and quick_abort values. +#Default: +# client_lifetime 1 day + +# TAG: half_closed_clients +# Some clients may shutdown the sending side of their TCP +# connections, while leaving their receiving sides open. Sometimes, +# Squid can not tell the difference between a half-closed and a +# fully-closed TCP connection. +# +# By default, Squid will immediately close client connections when +# read(2) returns "no more data to read." +# +# Change this option to 'on' and Squid will keep open connections +# until a read(2) or write(2) on the socket returns an error. +# This may show some benefits for reverse proxies. But if not +# it is recommended to leave OFF. +#Default: +# half_closed_clients off + +# TAG: pconn_timeout +# Timeout for idle persistent connections to servers and other +# proxies. +#Default: +# pconn_timeout 1 minute + +# TAG: ident_timeout +# Maximum time to wait for IDENT lookups to complete. +# +# If this is too high, and you enabled IDENT lookups from untrusted +# users, you might be susceptible to denial-of-service by having +# many ident requests going at once. +#Default: +# ident_timeout 10 seconds + +# TAG: shutdown_lifetime time-units +# When SIGTERM or SIGHUP is received, the cache is put into +# "shutdown pending" mode until all active sockets are closed. +# This value is the lifetime to set for all open descriptors +# during shutdown mode. Any active clients after this many +# seconds will receive a 'timeout' message. +#Default: +# shutdown_lifetime 30 seconds + +# ADMINISTRATIVE PARAMETERS +# ----------------------------------------------------------------------------- + +# TAG: cache_mgr +# Email-address of local cache manager who will receive +# mail if the cache dies. The default is "webmaster." +#Default: +# cache_mgr webmaster + +# TAG: mail_from +# From: email-address for mail sent when the cache dies. +# The default is to use 'appname@unique_hostname'. +# Default appname value is "squid", can be changed into +# src/globals.h before building squid. +#Default: +# none + +# TAG: mail_program +# Email program used to send mail if the cache dies. +# The default is "mail". The specified program must comply +# with the standard Unix mail syntax: +# mail-program recipient < mailfile +# +# Optional command line options can be specified. +#Default: +# mail_program mail + +# TAG: cache_effective_user +# If you start Squid as root, it will change its effective/real +# UID/GID to the user specified below. The default is to change +# to UID of nobody. +# see also; cache_effective_group +#Default: +# cache_effective_user nobody + +# TAG: cache_effective_group +# Squid sets the GID to the effective user's default group ID +# (taken from the password file) and supplementary group list +# from the groups membership. +# +# If you want Squid to run with a specific GID regardless of +# the group memberships of the effective user then set this +# to the group (or GID) you want Squid to run as. When set +# all other group privileges of the effective user are ignored +# and only this GID is effective. If Squid is not started as +# root the user starting Squid MUST be member of the specified +# group. +# +# This option is not recommended by the Squid Team. +# Our preference is for administrators to configure a secure +# user account for squid with UID/GID matching system policies. +#Default: +# none + +# TAG: httpd_suppress_version_string on|off +# Suppress Squid version string info in HTTP headers and HTML error pages. +#Default: +# httpd_suppress_version_string off + +# TAG: visible_hostname +# If you want to present a special hostname in error messages, etc, +# define this. Otherwise, the return value of gethostname() +# will be used. If you have multiple caches in a cluster and +# get errors about IP-forwarding you must set them to have individual +# names with this setting. +#Default: +# none + +# TAG: unique_hostname +# If you want to have multiple machines with the same +# 'visible_hostname' you must give each machine a different +# 'unique_hostname' so forwarding loops can be detected. +#Default: +# none + +# TAG: hostname_aliases +# A list of other DNS names your cache has. +#Default: +# none + +# TAG: umask +# Minimum umask which should be enforced while the proxy +# is running, in addition to the umask set at startup. +# +# For a traditional octal representation of umasks, start +# your value with 0. +#Default: +# umask 027 + +# OPTIONS FOR THE CACHE REGISTRATION SERVICE +# ----------------------------------------------------------------------------- +# +# This section contains parameters for the (optional) cache +# announcement service. This service is provided to help +# cache administrators locate one another in order to join or +# create cache hierarchies. +# +# An 'announcement' message is sent (via UDP) to the registration +# service by Squid. By default, the announcement message is NOT +# SENT unless you enable it with 'announce_period' below. +# +# The announcement message includes your hostname, plus the +# following information from this configuration file: +# +# http_port +# icp_port +# cache_mgr +# +# All current information is processed regularly and made +# available on the Web at http://www.ircache.net/Cache/Tracker/. + +# TAG: announce_period +# This is how frequently to send cache announcements. The +# default is `0' which disables sending the announcement +# messages. +# +# To enable announcing your cache, just set an announce period. +# +# Example: +# announce_period 1 day +#Default: +# announce_period 0 + +# TAG: announce_host +# TAG: announce_file +# TAG: announce_port +# announce_host and announce_port set the hostname and port +# number where the registration message will be sent. +# +# Hostname will default to 'tracker.ircache.net' and port will +# default default to 3131. If the 'filename' argument is given, +# the contents of that file will be included in the announce +# message. +#Default: +# announce_host tracker.ircache.net +# announce_port 3131 + +# HTTPD-ACCELERATOR OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: httpd_accel_surrogate_id +# Note: This option is only available if Squid is rebuilt with the +# --enable-esi option +# +# Surrogates (http://www.esi.org/architecture_spec_1.0.html) +# need an identification token to allow control targeting. Because +# a farm of surrogates may all perform the same tasks, they may share +# an identification token. +#Default: +# httpd_accel_surrogate_id unset-id + +# TAG: http_accel_surrogate_remote on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-esi option +# +# Remote surrogates (such as those in a CDN) honour Surrogate-Control: no-store-remote. +# Set this to on to have squid behave as a remote surrogate. +#Default: +# http_accel_surrogate_remote off + +# TAG: esi_parser libxml2|expat|custom +# Note: This option is only available if Squid is rebuilt with the +# --enable-esi option +# +# ESI markup is not strictly XML compatible. The custom ESI parser +# will give higher performance, but cannot handle non ASCII character +# encodings. +#Default: +# esi_parser custom + +# DELAY POOL PARAMETERS +# ----------------------------------------------------------------------------- + +# TAG: delay_pools +# Note: This option is only available if Squid is rebuilt with the +# --enable-delay-pools option +# +# This represents the number of delay pools to be used. For example, +# if you have one class 2 delay pool and one class 3 delays pool, you +# have a total of 2 delay pools. +#Default: +# delay_pools 0 + +# TAG: delay_class +# Note: This option is only available if Squid is rebuilt with the +# --enable-delay-pools option +# +# This defines the class of each delay pool. There must be exactly one +# delay_class line for each delay pool. For example, to define two +# delay pools, one of class 2 and one of class 3, the settings above +# and here would be: +# +# Example: +# delay_pools 4 # 4 delay pools +# delay_class 1 2 # pool 1 is a class 2 pool +# delay_class 2 3 # pool 2 is a class 3 pool +# delay_class 3 4 # pool 3 is a class 4 pool +# delay_class 4 5 # pool 4 is a class 5 pool +# +# The delay pool classes are: +# +# class 1 Everything is limited by a single aggregate +# bucket. +# +# class 2 Everything is limited by a single aggregate +# bucket as well as an "individual" bucket chosen +# from bits 25 through 32 of the IPv4 address. +# +# class 3 Everything is limited by a single aggregate +# bucket as well as a "network" bucket chosen +# from bits 17 through 24 of the IP address and a +# "individual" bucket chosen from bits 17 through +# 32 of the IPv4 address. +# +# class 4 Everything in a class 3 delay pool, with an +# additional limit on a per user basis. This +# only takes effect if the username is established +# in advance - by forcing authentication in your +# http_access rules. +# +# class 5 Requests are grouped according their tag (see +# external_acl's tag= reply). +# +# NOTE: If an IP address is a.b.c.d +# -> bits 25 through 32 are "d" +# -> bits 17 through 24 are "c" +# -> bits 17 through 32 are "c * 256 + d" +# +# NOTE-2: Due to the use of bitmasks in class 2,3,4 pools they only apply to +# IPv4 traffic. Class 1 and 5 pools may be used with IPv6 traffic. +#Default: +# none + +# TAG: delay_access +# Note: This option is only available if Squid is rebuilt with the +# --enable-delay-pools option +# +# This is used to determine which delay pool a request falls into. +# +# delay_access is sorted per pool and the matching starts with pool 1, +# then pool 2, ..., and finally pool N. The first delay pool where the +# request is allowed is selected for the request. If it does not allow +# the request to any pool then the request is not delayed (default). +# +# For example, if you want some_big_clients in delay +# pool 1 and lotsa_little_clients in delay pool 2: +# +#Example: +# delay_access 1 allow some_big_clients +# delay_access 1 deny all +# delay_access 2 allow lotsa_little_clients +# delay_access 2 deny all +# delay_access 3 allow authenticated_clients +#Default: +# none + +# TAG: delay_parameters +# Note: This option is only available if Squid is rebuilt with the +# --enable-delay-pools option +# +# This defines the parameters for a delay pool. Each delay pool has +# a number of "buckets" associated with it, as explained in the +# description of delay_class. For a class 1 delay pool, the syntax is: +# +#delay_parameters pool aggregate +# +# For a class 2 delay pool: +# +#delay_parameters pool aggregate individual +# +# For a class 3 delay pool: +# +#delay_parameters pool aggregate network individual +# +# For a class 4 delay pool: +# +#delay_parameters pool aggregate network individual user +# +# For a class 5 delay pool: +# +#delay_parameters pool tag +# +# The variables here are: +# +# pool a pool number - ie, a number between 1 and the +# number specified in delay_pools as used in +# delay_class lines. +# +# aggregate the "delay parameters" for the aggregate bucket +# (class 1, 2, 3). +# +# individual the "delay parameters" for the individual +# buckets (class 2, 3). +# +# network the "delay parameters" for the network buckets +# (class 3). +# +# user the delay parameters for the user buckets +# (class 4). +# +# tag the delay parameters for the tag buckets +# (class 5). +# +# A pair of delay parameters is written restore/maximum, where restore is +# the number of bytes (not bits - modem and network speeds are usually +# quoted in bits) per second placed into the bucket, and maximum is the +# maximum number of bytes which can be in the bucket at any time. +# +# For example, if delay pool number 1 is a class 2 delay pool as in the +# above example, and is being used to strictly limit each host to 64kbps +# (plus overheads), with no overall limit, the line is: +# +#delay_parameters 1 -1/-1 8000/8000 +# +# Note that the figure -1 is used to represent "unlimited". +# +# And, if delay pool number 2 is a class 3 delay pool as in the above +# example, and you want to limit it to a total of 256kbps (strict limit) +# with each 8-bit network permitted 64kbps (strict limit) and each +# individual host permitted 4800bps with a bucket maximum size of 64kb +# to permit a decent web page to be downloaded at a decent speed +# (if the network is not being limited due to overuse) but slow down +# large downloads more significantly: +# +#delay_parameters 2 32000/32000 8000/8000 600/8000 +# +# There must be one delay_parameters line for each delay pool. +# +# Finally, for a class 4 delay pool as in the example - each user will +# be limited to 128Kb no matter how many workstations they are logged into.: +# +#delay_parameters 4 32000/32000 8000/8000 600/64000 16000/16000 +#Default: +# none + +# TAG: delay_initial_bucket_level (percent, 0-100) +# Note: This option is only available if Squid is rebuilt with the +# --enable-delay-pools option +# +# The initial bucket percentage is used to determine how much is put +# in each bucket when squid starts, is reconfigured, or first notices +# a host accessing it (in class 2 and class 3, individual hosts and +# networks only have buckets associated with them once they have been +# "seen" by squid). +#Default: +# delay_initial_bucket_level 50 + +# WCCPv1 AND WCCPv2 CONFIGURATION OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: wccp_router +# Use this option to define your WCCP ``home'' router for +# Squid. +# +# wccp_router supports a single WCCP(v1) router +# +# wccp2_router supports multiple WCCPv2 routers +# +# only one of the two may be used at the same time and defines +# which version of WCCP to use. +#Default: +# wccp_router any_addr + +# TAG: wccp2_router +# Use this option to define your WCCP ``home'' router for +# Squid. +# +# wccp_router supports a single WCCP(v1) router +# +# wccp2_router supports multiple WCCPv2 routers +# +# only one of the two may be used at the same time and defines +# which version of WCCP to use. +#Default: +# none + +# TAG: wccp_version +# This directive is only relevant if you need to set up WCCP(v1) +# to some very old and end-of-life Cisco routers. In all other +# setups it must be left unset or at the default setting. +# It defines an internal version in the WCCP(v1) protocol, +# with version 4 being the officially documented protocol. +# +# According to some users, Cisco IOS 11.2 and earlier only +# support WCCP version 3. If you're using that or an earlier +# version of IOS, you may need to change this value to 3, otherwise +# do not specify this parameter. +#Default: +# wccp_version 4 + +# TAG: wccp2_rebuild_wait +# If this is enabled Squid will wait for the cache dir rebuild to finish +# before sending the first wccp2 HereIAm packet +#Default: +# wccp2_rebuild_wait on + +# TAG: wccp2_forwarding_method +# WCCP2 allows the setting of forwarding methods between the +# router/switch and the cache. Valid values are as follows: +# +# gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) +# l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) +# +# Currently (as of IOS 12.4) cisco routers only support GRE. +# Cisco switches only support the L2 redirect assignment method. +#Default: +# wccp2_forwarding_method gre + +# TAG: wccp2_return_method +# WCCP2 allows the setting of return methods between the +# router/switch and the cache for packets that the cache +# decides not to handle. Valid values are as follows: +# +# gre - GRE encapsulation (forward the packet in a GRE/WCCP tunnel) +# l2 - L2 redirect (forward the packet using Layer 2/MAC rewriting) +# +# Currently (as of IOS 12.4) cisco routers only support GRE. +# Cisco switches only support the L2 redirect assignment. +# +# If the "ip wccp redirect exclude in" command has been +# enabled on the cache interface, then it is still safe for +# the proxy server to use a l2 redirect method even if this +# option is set to GRE. +#Default: +# wccp2_return_method gre + +# TAG: wccp2_assignment_method +# WCCP2 allows the setting of methods to assign the WCCP hash +# Valid values are as follows: +# +# hash - Hash assignment +# mask - Mask assignment +# +# As a general rule, cisco routers support the hash assignment method +# and cisco switches support the mask assignment method. +#Default: +# wccp2_assignment_method hash + +# TAG: wccp2_service +# WCCP2 allows for multiple traffic services. There are two +# types: "standard" and "dynamic". The standard type defines +# one service id - http (id 0). The dynamic service ids can be from +# 51 to 255 inclusive. In order to use a dynamic service id +# one must define the type of traffic to be redirected; this is done +# using the wccp2_service_info option. +# +# The "standard" type does not require a wccp2_service_info option, +# just specifying the service id will suffice. +# +# MD5 service authentication can be enabled by adding +# "password=<password>" to the end of this service declaration. +# +# Examples: +# +# wccp2_service standard 0 # for the 'web-cache' standard service +# wccp2_service dynamic 80 # a dynamic service type which will be +# # fleshed out with subsequent options. +# wccp2_service standard 0 password=foo +#Default: +# wccp2_service standard 0 + +# TAG: wccp2_service_info +# Dynamic WCCPv2 services require further information to define the +# traffic you wish to have diverted. +# +# The format is: +# +# wccp2_service_info <id> protocol=<protocol> flags=<flag>,<flag>.. +# priority=<priority> ports=<port>,<port>.. +# +# The relevant WCCPv2 flags: +# + src_ip_hash, dst_ip_hash +# + source_port_hash, dst_port_hash +# + src_ip_alt_hash, dst_ip_alt_hash +# + src_port_alt_hash, dst_port_alt_hash +# + ports_source +# +# The port list can be one to eight entries. +# +# Example: +# +# wccp2_service_info 80 protocol=tcp flags=src_ip_hash,ports_source +# priority=240 ports=80 +# +# Note: the service id must have been defined by a previous +# 'wccp2_service dynamic <id>' entry. +#Default: +# none + +# TAG: wccp2_weight +# Each cache server gets assigned a set of the destination +# hash proportional to their weight. +#Default: +# wccp2_weight 10000 + +# TAG: wccp_address +# TAG: wccp2_address +# Use this option if you require WCCP to use a specific +# interface address. +# +# The default behavior is to not bind to any specific address. +#Default: +# wccp_address 0.0.0.0 +# wccp2_address 0.0.0.0 + +# PERSISTENT CONNECTION HANDLING +# ----------------------------------------------------------------------------- +# +# Also see "pconn_timeout" in the TIMEOUTS section + +# TAG: client_persistent_connections +# TAG: server_persistent_connections +# Persistent connection support for clients and servers. By +# default, Squid uses persistent connections (when allowed) +# with its clients and servers. You can use these options to +# disable persistent connections with clients and/or servers. +#Default: +# client_persistent_connections on +# server_persistent_connections on + +# TAG: persistent_connection_after_error +# With this directive the use of persistent connections after +# HTTP errors can be disabled. Useful if you have clients +# who fail to handle errors on persistent connections proper. +#Default: +# persistent_connection_after_error on + +# TAG: detect_broken_pconn +# Some servers have been found to incorrectly signal the use +# of HTTP/1.0 persistent connections even on replies not +# compatible, causing significant delays. This server problem +# has mostly been seen on redirects. +# +# By enabling this directive Squid attempts to detect such +# broken replies and automatically assume the reply is finished +# after 10 seconds timeout. +#Default: +# detect_broken_pconn off + +# CACHE DIGEST OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: digest_generation +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This controls whether the server will generate a Cache Digest +# of its contents. By default, Cache Digest generation is +# enabled if Squid is compiled with --enable-cache-digests defined. +#Default: +# digest_generation on + +# TAG: digest_bits_per_entry +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This is the number of bits of the server's Cache Digest which +# will be associated with the Digest entry for a given HTTP +# Method and URL (public key) combination. The default is 5. +#Default: +# digest_bits_per_entry 5 + +# TAG: digest_rebuild_period (seconds) +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This is the wait time between Cache Digest rebuilds. +#Default: +# digest_rebuild_period 1 hour + +# TAG: digest_rewrite_period (seconds) +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This is the wait time between Cache Digest writes to +# disk. +#Default: +# digest_rewrite_period 1 hour + +# TAG: digest_swapout_chunk_size (bytes) +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This is the number of bytes of the Cache Digest to write to +# disk at a time. It defaults to 4096 bytes (4KB), the Squid +# default swap page. +#Default: +# digest_swapout_chunk_size 4096 bytes + +# TAG: digest_rebuild_chunk_percentage (percent, 0-100) +# Note: This option is only available if Squid is rebuilt with the +# --enable-cache-digests option +# +# This is the percentage of the Cache Digest to be scanned at a +# time. By default it is set to 10% of the Cache Digest. +#Default: +# digest_rebuild_chunk_percentage 10 + +# SNMP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: snmp_port +# The port number where Squid listens for SNMP requests. To enable +# SNMP support set this to a suitable port number. Port number +# 3401 is often used for the Squid SNMP agent. By default it's +# set to "0" (disabled) +# +# Example: +# snmp_port 3401 +#Default: +# snmp_port 0 + +# TAG: snmp_access +# Allowing or denying access to the SNMP port. +# +# All access to the agent is denied by default. +# usage: +# +# snmp_access allow|deny [!]aclname ... +# +# This clause only supports fast acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Example: +# snmp_access allow snmppublic localhost +# snmp_access deny all +#Default: +# snmp_access deny all + +# TAG: snmp_incoming_address +# TAG: snmp_outgoing_address +# Just like 'udp_incoming_address', but for the SNMP port. +# +# snmp_incoming_address is used for the SNMP socket receiving +# messages from SNMP agents. +# snmp_outgoing_address is used for SNMP packets returned to SNMP +# agents. +# +# The default snmp_incoming_address is to listen on all +# available network interfaces. +# +# If snmp_outgoing_address is not set it will use the same socket +# as snmp_incoming_address. Only change this if you want to have +# SNMP replies sent using another address than where this Squid +# listens for SNMP queries. +# +# NOTE, snmp_incoming_address and snmp_outgoing_address can not have +# the same value since they both use port 3401. +#Default: +# snmp_incoming_address any_addr +# snmp_outgoing_address no_addr + +# ICP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icp_port +# The port number where Squid sends and receives ICP queries to +# and from neighbor caches. The standard UDP port for ICP is 3130. +# Default is disabled (0). +# +# Example: +# icp_port 3130 +#Default: +# icp_port 0 + +# TAG: htcp_port +# The port number where Squid sends and receives HTCP queries to +# and from neighbor caches. To turn it on you want to set it to +# 4827. By default it is set to "0" (disabled). +# +# Example: +# htcp_port 4827 +#Default: +# htcp_port 0 + +# TAG: log_icp_queries on|off +# If set, ICP queries are logged to access.log. You may wish +# do disable this if your ICP load is VERY high to speed things +# up or to simplify log analysis. +#Default: +# log_icp_queries on + +# TAG: udp_incoming_address +# udp_incoming_address is used for UDP packets received from other +# caches. +# +# The default behavior is to not bind to any specific address. +# +# Only change this if you want to have all UDP queries received on +# a specific interface/address. +# +# NOTE: udp_incoming_address is used by the ICP, HTCP, and DNS +# modules. Altering it will affect all of them in the same manner. +# +# see also; udp_outgoing_address +# +# NOTE, udp_incoming_address and udp_outgoing_address can not +# have the same value since they both use the same port. +#Default: +# udp_incoming_address any_addr + +# TAG: udp_outgoing_address +# udp_outgoing_address is used for UDP packets sent out to other +# caches. +# +# The default behavior is to not bind to any specific address. +# +# Instead it will use the same socket as udp_incoming_address. +# Only change this if you want to have UDP queries sent using another +# address than where this Squid listens for UDP queries from other +# caches. +# +# NOTE: udp_outgoing_address is used by the ICP, HTCP, and DNS +# modules. Altering it will affect all of them in the same manner. +# +# see also; udp_incoming_address +# +# NOTE, udp_incoming_address and udp_outgoing_address can not +# have the same value since they both use the same port. +#Default: +# udp_outgoing_address no_addr + +# TAG: icp_hit_stale on|off +# If you want to return ICP_HIT for stale cache objects, set this +# option to 'on'. If you have sibling relationships with caches +# in other administrative domains, this should be 'off'. If you only +# have sibling relationships with caches under your control, +# it is probably okay to set this to 'on'. +# If set to 'on', your siblings should use the option "allow-miss" +# on their cache_peer lines for connecting to you. +#Default: +# icp_hit_stale off + +# TAG: minimum_direct_hops +# If using the ICMP pinging stuff, do direct fetches for sites +# which are no more than this many hops away. +#Default: +# minimum_direct_hops 4 + +# TAG: minimum_direct_rtt +# If using the ICMP pinging stuff, do direct fetches for sites +# which are no more than this many rtt milliseconds away. +#Default: +# minimum_direct_rtt 400 + +# TAG: netdb_low +# TAG: netdb_high +# The low and high water marks for the ICMP measurement +# database. These are counts, not percents. The defaults are +# 900 and 1000. When the high water mark is reached, database +# entries will be deleted until the low mark is reached. +#Default: +# netdb_low 900 +# netdb_high 1000 + +# TAG: netdb_ping_period +# The minimum period for measuring a site. There will be at +# least this much delay between successive pings to the same +# network. The default is five minutes. +#Default: +# netdb_ping_period 5 minutes + +# TAG: query_icmp on|off +# If you want to ask your peers to include ICMP data in their ICP +# replies, enable this option. +# +# If your peer has configured Squid (during compilation) with +# '--enable-icmp' that peer will send ICMP pings to origin server +# sites of the URLs it receives. If you enable this option the +# ICP replies from that peer will include the ICMP data (if available). +# Then, when choosing a parent cache, Squid will choose the parent with +# the minimal RTT to the origin server. When this happens, the +# hierarchy field of the access.log will be +# "CLOSEST_PARENT_MISS". This option is off by default. +#Default: +# query_icmp off + +# TAG: test_reachability on|off +# When this is 'on', ICP MISS replies will be ICP_MISS_NOFETCH +# instead of ICP_MISS if the target host is NOT in the ICMP +# database, or has a zero RTT. +#Default: +# test_reachability off + +# TAG: icp_query_timeout (msec) +# Normally Squid will automatically determine an optimal ICP +# query timeout value based on the round-trip-time of recent ICP +# queries. If you want to override the value determined by +# Squid, set this 'icp_query_timeout' to a non-zero value. This +# value is specified in MILLISECONDS, so, to use a 2-second +# timeout (the old default), you would write: +# +# icp_query_timeout 2000 +#Default: +# icp_query_timeout 0 + +# TAG: maximum_icp_query_timeout (msec) +# Normally the ICP query timeout is determined dynamically. But +# sometimes it can lead to very large values (say 5 seconds). +# Use this option to put an upper limit on the dynamic timeout +# value. Do NOT use this option to always use a fixed (instead +# of a dynamic) timeout value. To set a fixed timeout see the +# 'icp_query_timeout' directive. +#Default: +# maximum_icp_query_timeout 2000 + +# TAG: minimum_icp_query_timeout (msec) +# Normally the ICP query timeout is determined dynamically. But +# sometimes it can lead to very small timeouts, even lower than +# the normal latency variance on your link due to traffic. +# Use this option to put an lower limit on the dynamic timeout +# value. Do NOT use this option to always use a fixed (instead +# of a dynamic) timeout value. To set a fixed timeout see the +# 'icp_query_timeout' directive. +#Default: +# minimum_icp_query_timeout 5 + +# TAG: background_ping_rate time-units +# Controls how often the ICP pings are sent to siblings that +# have background-ping set. +#Default: +# background_ping_rate 10 seconds + +# MULTICAST ICP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: mcast_groups +# This tag specifies a list of multicast groups which your server +# should join to receive multicasted ICP queries. +# +# NOTE! Be very careful what you put here! Be sure you +# understand the difference between an ICP _query_ and an ICP +# _reply_. This option is to be set only if you want to RECEIVE +# multicast queries. Do NOT set this option to SEND multicast +# ICP (use cache_peer for that). ICP replies are always sent via +# unicast, so this option does not affect whether or not you will +# receive replies from multicast group members. +# +# You must be very careful to NOT use a multicast address which +# is already in use by another group of caches. +# +# If you are unsure about multicast, please read the Multicast +# chapter in the Squid FAQ (http://www.squid-cache.org/FAQ/). +# +# Usage: mcast_groups 239.128.16.128 224.0.1.20 +# +# By default, Squid doesn't listen on any multicast groups. +#Default: +# none + +# TAG: mcast_miss_addr +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# If you enable this option, every "cache miss" URL will +# be sent out on the specified multicast address. +# +# Do not enable this option unless you are are absolutely +# certain you understand what you are doing. +#Default: +# mcast_miss_addr no_addr + +# TAG: mcast_miss_ttl +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# This is the time-to-live value for packets multicasted +# when multicasting off cache miss URLs is enabled. By +# default this is set to 'site scope', i.e. 16. +#Default: +# mcast_miss_ttl 16 + +# TAG: mcast_miss_port +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# This is the port number to be used in conjunction with +# 'mcast_miss_addr'. +#Default: +# mcast_miss_port 3135 + +# TAG: mcast_miss_encode_key +# Note: This option is only available if Squid is rebuilt with the +# -DMULTICAST_MISS_STREAM define +# +# The URLs that are sent in the multicast miss stream are +# encrypted. This is the encryption key. +#Default: +# mcast_miss_encode_key XXXXXXXXXXXXXXXX + +# TAG: mcast_icp_query_timeout (msec) +# For multicast peers, Squid regularly sends out ICP "probes" to +# count how many other peers are listening on the given multicast +# address. This value specifies how long Squid should wait to +# count all the replies. The default is 2000 msec, or 2 +# seconds. +#Default: +# mcast_icp_query_timeout 2000 + +# INTERNAL ICON OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icon_directory +# Where the icons are stored. These are normally kept in +# /usr/share/squid/icons +#Default: +# icon_directory /usr/share/squid/icons + +# TAG: global_internal_static +# This directive controls is Squid should intercept all requests for +# /squid-internal-static/ no matter which host the URL is requesting +# (default on setting), or if nothing special should be done for +# such URLs (off setting). The purpose of this directive is to make +# icons etc work better in complex cache hierarchies where it may +# not always be possible for all corners in the cache mesh to reach +# the server generating a directory listing. +#Default: +# global_internal_static on + +# TAG: short_icon_urls +# If this is enabled Squid will use short URLs for icons. +# If disabled it will revert to the old behavior of including +# it's own name and port in the URL. +# +# If you run a complex cache hierarchy with a mix of Squid and +# other proxies you may need to disable this directive. +#Default: +# short_icon_urls on + +# ERROR PAGE OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: error_directory +# If you wish to create your own versions of the default +# error files to customize them to suit your company copy +# the error/template files to another directory and point +# this tag at them. +# +# WARNING: This option will disable multi-language support +# on error pages if used. +# +# The squid developers are interested in making squid available in +# a wide variety of languages. If you are making translations for a +# language that Squid does not currently provide please consider +# contributing your translation back to the project. +# http://wiki.squid-cache.org/Translations +# +# The squid developers working on translations are happy to supply drop-in +# translated error files in exchange for any new language contributions. +#Default: +# none + +# TAG: error_default_language +# Set the default language which squid will send error pages in +# if no existing translation matches the clients language +# preferences. +# +# If unset (default) generic English will be used. +# +# The squid developers are interested in making squid available in +# a wide variety of languages. If you are interested in making +# translations for any language see the squid wiki for details. +# http://wiki.squid-cache.org/Translations +#Default: +# none + +# TAG: error_log_languages +# Log to cache.log what languages users are attempting to +# auto-negotiate for translations. +# +# Successful negotiations are not logged. Only failures +# have meaning to indicate that Squid may need an upgrade +# of its error page translations. +#Default: +# error_log_languages on + +# TAG: err_page_stylesheet +# CSS Stylesheet to pattern the display of Squid default error pages. +# +# For information on CSS see http://www.w3.org/Style/CSS/ +#Default: +# err_page_stylesheet /etc/squid/errorpage.css + +# TAG: err_html_text +# HTML text to include in error messages. Make this a "mailto" +# URL to your admin address, or maybe just a link to your +# organizations Web page. +# +# To include this in your error messages, you must rewrite +# the error template files (found in the "errors" directory). +# Wherever you want the 'err_html_text' line to appear, +# insert a %L tag in the error template file. +#Default: +# none + +# TAG: email_err_data on|off +# If enabled, information about the occurred error will be +# included in the mailto links of the ERR pages (if %W is set) +# so that the email body contains the data. +# Syntax is <A HREF="mailto:%w%W">%w</A> +#Default: +# email_err_data on + +# TAG: deny_info +# Usage: deny_info err_page_name acl +# or deny_info http://... acl +# or deny_info TCP_RESET acl +# +# This can be used to return a ERR_ page for requests which +# do not pass the 'http_access' rules. Squid remembers the last +# acl it evaluated in http_access, and if a 'deny_info' line exists +# for that ACL Squid returns a corresponding error page. +# +# The acl is typically the last acl on the http_access deny line which +# denied access. The exceptions to this rule are: +# - When Squid needs to request authentication credentials. It's then +# the first authentication related acl encountered +# - When none of the http_access lines matches. It's then the last +# acl processed on the last http_access line. +# +# NP: If providing your own custom error pages with error_directory +# you may also specify them by your custom file name: +# Example: deny_info ERR_CUSTOM_ACCESS_DENIED bad_guys +# +# Alternatively you can specify an error URL. The browsers will +# get redirected (302 or 307) to the specified URL. %s in the redirection +# URL will be replaced by the requested URL. +# +# Alternatively you can tell Squid to reset the TCP connection +# by specifying TCP_RESET. +#Default: +# none + +# OPTIONS INFLUENCING REQUEST FORWARDING +# ----------------------------------------------------------------------------- + +# TAG: nonhierarchical_direct +# By default, Squid will send any non-hierarchical requests +# (matching hierarchy_stoplist or not cacheable request type) direct +# to origin servers. +# +# If you set this to off, Squid will prefer to send these +# requests to parents. +# +# Note that in most configurations, by turning this off you will only +# add latency to these request without any improvement in global hit +# ratio. +# +# If you are inside an firewall see never_direct instead of +# this directive. +#Default: +# nonhierarchical_direct on + +# TAG: prefer_direct +# Normally Squid tries to use parents for most requests. If you for some +# reason like it to first try going direct and only use a parent if +# going direct fails set this to on. +# +# By combining nonhierarchical_direct off and prefer_direct on you +# can set up Squid to use a parent as a backup path if going direct +# fails. +# +# Note: If you want Squid to use parents for all requests see +# the never_direct directive. prefer_direct only modifies how Squid +# acts on cacheable requests. +#Default: +# prefer_direct off + +# TAG: always_direct +# Usage: always_direct allow|deny [!]aclname ... +# +# Here you can use ACL elements to specify requests which should +# ALWAYS be forwarded by Squid to the origin servers without using +# any peers. For example, to always directly forward requests for +# local servers ignoring any parents or siblings you may have use +# something like: +# +# acl local-servers dstdomain my.domain.net +# always_direct allow local-servers +# +# To always forward FTP requests directly, use +# +# acl FTP proto FTP +# always_direct allow FTP +# +# NOTE: There is a similar, but opposite option named +# 'never_direct'. You need to be aware that "always_direct deny +# foo" is NOT the same thing as "never_direct allow foo". You +# may need to use a deny rule to exclude a more-specific case of +# some other rule. Example: +# +# acl local-external dstdomain external.foo.net +# acl local-servers dstdomain .foo.net +# always_direct deny local-external +# always_direct allow local-servers +# +# NOTE: If your goal is to make the client forward the request +# directly to the origin server bypassing Squid then this needs +# to be done in the client configuration. Squid configuration +# can only tell Squid how Squid should fetch the object. +# +# NOTE: This directive is not related to caching. The replies +# is cached as usual even if you use always_direct. To not cache +# the replies see the 'cache' directive. +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# TAG: never_direct +# Usage: never_direct allow|deny [!]aclname ... +# +# never_direct is the opposite of always_direct. Please read +# the description for always_direct if you have not already. +# +# With 'never_direct' you can use ACL elements to specify +# requests which should NEVER be forwarded directly to origin +# servers. For example, to force the use of a proxy for all +# requests, except those in your local domain use something like: +# +# acl local-servers dstdomain .foo.net +# never_direct deny local-servers +# never_direct allow all +# +# or if Squid is inside a firewall and there are local intranet +# servers inside the firewall use something like: +# +# acl local-intranet dstdomain .foo.net +# acl local-external dstdomain external.foo.net +# always_direct deny local-external +# always_direct allow local-intranet +# never_direct allow all +# +# This clause supports both fast and slow acl types. +# See http://wiki.squid-cache.org/SquidFaq/SquidAcl for details. +#Default: +# none + +# ADVANCED NETWORKING OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: incoming_icp_average +# TAG: incoming_http_average +# TAG: incoming_dns_average +# TAG: min_icp_poll_cnt +# TAG: min_dns_poll_cnt +# TAG: min_http_poll_cnt +# Heavy voodoo here. I can't even believe you are reading this. +# Are you crazy? Don't even think about adjusting these unless +# you understand the algorithms in comm_select.c first! +#Default: +# incoming_icp_average 6 +# incoming_http_average 4 +# incoming_dns_average 4 +# min_icp_poll_cnt 8 +# min_dns_poll_cnt 8 +# min_http_poll_cnt 8 + +# TAG: accept_filter +# FreeBSD: +# +# The name of an accept(2) filter to install on Squid's +# listen socket(s). This feature is perhaps specific to +# FreeBSD and requires support in the kernel. +# +# The 'httpready' filter delays delivering new connections +# to Squid until a full HTTP request has been received. +# See the accf_http(9) man page for details. +# +# The 'dataready' filter delays delivering new connections +# to Squid until there is some data to process. +# See the accf_dataready(9) man page for details. +# +# Linux: +# +# The 'data' filter delays delivering of new connections +# to Squid until there is some data to process by TCP_ACCEPT_DEFER. +# You may optionally specify a number of seconds to wait by +# 'data=N' where N is the number of seconds. Defaults to 30 +# if not specified. See the tcp(7) man page for details. +#EXAMPLE: +## FreeBSD +#accept_filter httpready +## Linux +#accept_filter data +#Default: +# none + +# TAG: client_ip_max_connections +# Set an absolute limit on the number of connections a single +# client IP can use. Any more than this and Squid will begin to drop +# new connections from the client until it closes some links. +# +# Note that this is a global limit. It affects all HTTP, HTCP, Gopher and FTP +# connections from the client. For finer control use the ACL access controls. +# +# Requires client_db to be enabled (the default). +# +# WARNING: This may noticably slow down traffic received via external proxies +# or NAT devices and cause them to rebound error messages back to their clients. +#Default: +# client_ip_max_connections -1 + +# TAG: tcp_recv_bufsize (bytes) +# Size of receive buffer to set for TCP sockets. Probably just +# as easy to change your kernel's default. Set to zero to use +# the default buffer size. +#Default: +# tcp_recv_bufsize 0 bytes + +# ICAP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: icap_enable on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# If you want to enable the ICAP module support, set this to on. +#Default: +# icap_enable off + +# TAG: icap_connect_timeout +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This parameter specifies how long to wait for the TCP connect to +# the requested ICAP server to complete before giving up and either +# terminating the HTTP transaction or bypassing the failure. +# +# The default for optional services is peer_connect_timeout. +# The default for essential services is connect_timeout. +# If this option is explicitly set, its value applies to all services. +#Default: +# none + +# TAG: icap_io_timeout time-units +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This parameter specifies how long to wait for an I/O activity on +# an established, active ICAP connection before giving up and +# either terminating the HTTP transaction or bypassing the +# failure. +# +# The default is read_timeout. +#Default: +# none + +# TAG: icap_service_failure_limit +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# The limit specifies the number of failures that Squid tolerates +# when establishing a new TCP connection with an ICAP service. If +# the number of failures exceeds the limit, the ICAP service is +# not used for new ICAP requests until it is time to refresh its +# OPTIONS. The per-service failure counter is reset to zero each +# time Squid fetches new service OPTIONS. +# +# A negative value disables the limit. Without the limit, an ICAP +# service will not be considered down due to connectivity failures +# between ICAP OPTIONS requests. +#Default: +# icap_service_failure_limit 10 + +# TAG: icap_service_revival_delay +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# The delay specifies the number of seconds to wait after an ICAP +# OPTIONS request failure before requesting the options again. The +# failed ICAP service is considered "down" until fresh OPTIONS are +# fetched. +# +# The actual delay cannot be smaller than the hardcoded minimum +# delay of 30 seconds. +#Default: +# icap_service_revival_delay 180 + +# TAG: icap_preview_enable on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# The ICAP Preview feature allows the ICAP server to handle the +# HTTP message by looking only at the beginning of the message body +# or even without receiving the body at all. In some environments, +# previews greatly speedup ICAP processing. +# +# During an ICAP OPTIONS transaction, the server may tell Squid what +# HTTP messages should be previewed and how big the preview should be. +# Squid will not use Preview if the server did not request one. +# +# To disable ICAP Preview for all ICAP services, regardless of +# individual ICAP server OPTIONS responses, set this option to "off". +#Example: +#icap_preview_enable off +#Default: +# icap_preview_enable on + +# TAG: icap_preview_size +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# The default size of preview data to be sent to the ICAP server. +# -1 means no preview. This value might be overwritten on a per server +# basis by OPTIONS requests. +#Default: +# icap_preview_size -1 + +# TAG: icap_default_options_ttl +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# The default TTL value for ICAP OPTIONS responses that don't have +# an Options-TTL header. +#Default: +# icap_default_options_ttl 60 + +# TAG: icap_persistent_connections on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# Whether or not Squid should use persistent connections to +# an ICAP server. +#Default: +# icap_persistent_connections on + +# TAG: icap_send_client_ip on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This adds the header "X-Client-IP" to ICAP requests. +#Default: +# icap_send_client_ip off + +# TAG: icap_send_client_username on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This sends authenticated HTTP client username (if available) to +# the ICAP service. The username value is encoded based on the +# icap_client_username_encode option and is sent using the header +# specified by the icap_client_username_header option. +#Default: +# icap_send_client_username off + +# TAG: icap_client_username_header +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# ICAP request header name to use for send_client_username. +#Default: +# icap_client_username_header X-Client-Username + +# TAG: icap_client_username_encode on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# Whether to base64 encode the authenticated client username. +#Default: +# icap_client_username_encode off + +# TAG: icap_service +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# Defines a single ICAP service using the following format: +# +# icap_service service_name vectoring_point [options] service_url +# +# service_name: ID +# an opaque identifier which must be unique in squid.conf +# +# vectoring_point: reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache +# This specifies at which point of transaction processing the +# ICAP service should be activated. *_postcache vectoring points +# are not yet supported. +# +# service_url: icap://servername:port/servicepath +# ICAP server and service location. +# +# ICAP does not allow a single service to handle both REQMOD and RESPMOD +# transactions. Squid does not enforce that requirement. You can specify +# services with the same service_url and different vectoring_points. You +# can even specify multiple identical services as long as their +# service_names differ. +# +# +# Service options are separated by white space. ICAP services support +# the following name=value options: +# +# bypass=on|off|1|0 +# If set to 'on' or '1', the ICAP service is treated as +# optional. If the service cannot be reached or malfunctions, +# Squid will try to ignore any errors and process the message as +# if the service was not enabled. No all ICAP errors can be +# bypassed. If set to 0, the ICAP service is treated as +# essential and all ICAP errors will result in an error page +# returned to the HTTP client. +# +# Bypass is off by default: services are treated as essential. +# +# routing=on|off|1|0 +# If set to 'on' or '1', the ICAP service is allowed to +# dynamically change the current message adaptation plan by +# returning a chain of services to be used next. The services +# are specified using the X-Next-Services ICAP response header +# value, formatted as a comma-separated list of service names. +# Each named service should be configured in squid.conf and +# should have the same method and vectoring point as the current +# ICAP transaction. Services violating these rules are ignored. +# An empty X-Next-Services value results in an empty plan which +# ends the current adaptation. +# +# Routing is not allowed by default: the ICAP X-Next-Services +# response header is ignored. +# +# ipv6=on|off +# Only has effect on split-stack systems. The default on those systems +# is to use IPv4-only connections. When set to 'on' this option will +# make Squid use IPv6-only connections to contact this ICAP service. +# +# Older icap_service format without optional named parameters is +# deprecated but supported for backward compatibility. +# +#Example: +#icap_service svcBlocker reqmod_precache bypass=0 icap://icap1.mydomain.net:1344/reqmod +#icap_service svcLogger reqmod_precache routing=on icap://icap2.mydomain.net:1344/respmod +#Default: +# none + +# TAG: icap_class +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This deprecated option was documented to define an ICAP service +# chain, even though it actually defined a set of similar, redundant +# services, and the chains were not supported. +# +# To define a set of redundant services, please use the +# adaptation_service_set directive. For service chains, use +# adaptation_service_chain. +#Default: +# none + +# TAG: icap_access +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This option is deprecated. Please use adaptation_access, which +# has the same ICAP functionality, but comes with better +# documentation, and eCAP support. +#Default: +# none + +# eCAP OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: ecap_enable on|off +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap option +# +# Controls whether eCAP support is enabled. +#Default: +# ecap_enable off + +# TAG: ecap_service +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap option +# +# Defines a single eCAP service +# +# ecap_service servicename vectoring_point bypass service_url +# +# vectoring_point = reqmod_precache|reqmod_postcache|respmod_precache|respmod_postcache +# This specifies at which point of transaction processing the +# eCAP service should be activated. *_postcache vectoring points +# are not yet supported. +# bypass = 1|0 +# If set to 1, the eCAP service is treated as optional. If the +# service cannot be reached or malfunctions, Squid will try to +# ignore any errors and process the message as if the service +# was not enabled. No all eCAP errors can be bypassed. +# If set to 0, the eCAP service is treated as essential and all +# eCAP errors will result in an error page returned to the +# HTTP client. +# service_url = ecap://vendor/service_name?custom&cgi=style¶meters=optional +# +#Example: +#ecap_service service_1 reqmod_precache 0 ecap://filters-R-us/leakDetector?on_error=block +#ecap_service service_2 respmod_precache 1 icap://filters-R-us/virusFilter?config=/etc/vf.cfg +#Default: +# none + +# TAG: loadable_modules +# Instructs Squid to load the specified dynamic module(s) or activate +# preloaded module(s). +#Example: +#loadable_modules /usr/lib/MinimalAdapter.so +#Default: +# none + +# MESSAGE ADAPTATION OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: adaptation_service_set +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap or --enable-icap-client option +# +# +# Configures an ordered set of similar, redundant services. This is +# useful when hot standby or backup adaptation servers are available. +# +# adaptation_service_set set_name service_name1 service_name2 ... +# +# The named services are used in the set declaration order. The first +# applicable adaptation service from the set is used first. The next +# applicable service is tried if and only if the transaction with the +# previous service fails and the message waiting to be adapted is still +# intact. +# +# When adaptation starts, broken services are ignored as if they were +# not a part of the set. A broken service is a down optional service. +# +# The services in a set must be attached to the same vectoring point +# (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). +# +# If all services in a set are optional then adaptation failures are +# bypassable. If all services in the set are essential, then a +# transaction failure with one service may still be retried using +# another service from the set, but when all services fail, the master +# transaction fails as well. +# +# A set may contain a mix of optional and essential services, but that +# is likely to lead to surprising results because broken services become +# ignored (see above), making previously bypassable failures fatal. +# Technically, it is the bypassability of the last failed service that +# matters. +# +# See also: adaptation_access adaptation_service_chain +# +#Example: +#adaptation_service_set svcBlocker urlFilterPrimary urlFilterBackup +#adaptation service_set svcLogger loggerLocal loggerRemote +#Default: +# none + +# TAG: adaptation_service_chain +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap or --enable-icap-client option +# +# +# Configures a list of complementary services that will be applied +# one-by-one, forming an adaptation chain or pipeline. This is useful +# when Squid must perform different adaptations on the same message. +# +# adaptation_service_chain chain_name service_name1 svc_name2 ... +# +# The named services are used in the chain declaration order. The first +# applicable adaptation service from the chain is used first. The next +# applicable service is applied to the successful adaptation results of +# the previous service in the chain. +# +# When adaptation starts, broken services are ignored as if they were +# not a part of the chain. A broken service is a down optional service. +# +# Request satisfaction terminates the adaptation chain because Squid +# does not currently allow declaration of RESPMOD services at the +# "reqmod_precache" vectoring point (see icap_service or ecap_service). +# +# The services in a chain must be attached to the same vectoring point +# (e.g., pre-cache) and use the same adaptation method (e.g., REQMOD). +# +# A chain may contain a mix of optional and essential services. If an +# essential adaptation fails (or the failure cannot be bypassed for +# other reasons), the master transaction fails. Otherwise, the failure +# is bypassed as if the failed adaptation service was not in the chain. +# +# See also: adaptation_access adaptation_service_set +# +#Example: +#adaptation_service_chain svcRequest requestLogger urlFilter leakDetector +#Default: +# none + +# TAG: adaptation_access +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap or --enable-icap-client option +# +# Sends an HTTP transaction to an ICAP or eCAP adaptation service. +# +# adaptation_access service_name allow|deny [!]aclname... +# adaptation_access set_name allow|deny [!]aclname... +# +# At each supported vectoring point, the adaptation_access +# statements are processed in the order they appear in this +# configuration file. Statements pointing to the following services +# are ignored (i.e., skipped without checking their ACL): +# +# - services serving different vectoring points +# - "broken-but-bypassable" services +# - "up" services configured to ignore such transactions +# (e.g., based on the ICAP Transfer-Ignore header). +# +# When a set_name is used, all services in the set are checked +# using the same rules, to find the first applicable one. See +# adaptation_service_set for details. +# +# If an access list is checked and there is a match, the +# processing stops: For an "allow" rule, the corresponding +# adaptation service is used for the transaction. For a "deny" +# rule, no adaptation service is activated. +# +# It is currently not possible to apply more than one adaptation +# service at the same vectoring point to the same HTTP transaction. +# +# See also: icap_service and ecap_service +# +#Example: +#adaptation_access service_1 allow all +#Default: +# none + +# TAG: adaptation_service_iteration_limit +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap or --enable-icap-client option +# +# Limits the number of iterations allowed when applying adaptation +# services to a message. If your longest adaptation set or chain +# may have more than 16 services, increase the limit beyond its +# default value of 16. If detecting infinite iteration loops sooner +# is critical, make the iteration limit match the actual number +# of services in your longest adaptation set or chain. +# +# Infinite adaptation loops are most likely with routing services. +# +# See also: icap_service routing=1 +#Default: +# adaptation_service_iteration_limit 16 + +# TAG: adaptation_masterx_shared_names +# Note: This option is only available if Squid is rebuilt with the +# --enable-ecap or --enable-icap-client option +# +# For each master transaction (i.e., the HTTP request and response +# sequence, including all related ICAP and eCAP exchanges), Squid +# maintains a table of metadata. The table entries are (name, value) +# pairs shared among eCAP and ICAP exchanges. The table is destroyed +# with the master transaction. +# +# This option specifies the table entry names that Squid must accept +# from and forward to the adaptation transactions. +# +# An ICAP REQMOD or RESPMOD transaction may set an entry in the +# shared table by returning an ICAP header field with a name +# specified in adaptation_masterx_shared_names. Squid will store +# and forward that ICAP header field to subsequent ICAP +# transactions within the same master transaction scope. +# +# Only one shared entry name is supported at this time. +# +#Example: +## share authentication information among ICAP services +#adaptation_masterx_shared_names X-Subscriber-ID +#Default: +# none + +# TAG: icap_retry +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# This ACL determines which retriable ICAP transactions are +# retried. Transactions that received a complete ICAP response +# and did not have to consume or produce HTTP bodies to receive +# that response are usually retriable. +# +# icap_retry allow|deny [!]aclname ... +# +# Squid automatically retries some ICAP I/O timeouts and errors +# due to persistent connection race conditions. +# +# See also: icap_retry_limit +#Default: +# icap_retry deny all + +# TAG: icap_retry_limit +# Note: This option is only available if Squid is rebuilt with the +# --enable-icap-client option +# +# Limits the number of retries allowed. When set to zero (default), +# no retries are allowed. +# +# Communication errors due to persistent connection race +# conditions are unavoidable, automatically retried, and do not +# count against this limit. +# +# See also: icap_retry +#Default: +# icap_retry_limit 0 + +# DNS OPTIONS +# ----------------------------------------------------------------------------- + +# TAG: check_hostnames +# For security and stability reasons Squid can check +# hostnames for Internet standard RFC compliance. If you want +# Squid to perform these checks turn this directive on. +#Default: +# check_hostnames off + +# TAG: allow_underscore +# Underscore characters is not strictly allowed in Internet hostnames +# but nevertheless used by many sites. Set this to off if you want +# Squid to be strict about the standard. +# This check is performed only when check_hostnames is set to on. +#Default: +# allow_underscore on + +# TAG: cache_dns_program +# Note: This option is only available if Squid is rebuilt with the +# --disable-internal-dns option +# +# Specify the location of the executable for dnslookup process. +#Default: +# cache_dns_program /usr/libexec/dnsserver + +# TAG: dns_children +# Note: This option is only available if Squid is rebuilt with the +# --disable-internal-dns option +# +# The number of processes spawn to service DNS name lookups. +# For heavily loaded caches on large servers, you should +# probably increase this value to at least 10. The maximum +# is 32. The default is 5. +# +# You must have at least one dnsserver process. +#Default: +# dns_children 5 + +# TAG: dns_retransmit_interval +# Initial retransmit interval for DNS queries. The interval is +# doubled each time all configured DNS servers have been tried. +# +#Default: +# dns_retransmit_interval 5 seconds + +# TAG: dns_timeout +# DNS Query timeout. If no response is received to a DNS query +# within this time all DNS servers for the queried domain +# are assumed to be unavailable. +#Default: +# dns_timeout 2 minutes + +# TAG: dns_defnames on|off +# Normally the RES_DEFNAMES resolver option is disabled +# (see res_init(3)). This prevents caches in a hierarchy +# from interpreting single-component hostnames locally. To allow +# Squid to handle single-component names, enable this option. +#Default: +# dns_defnames off + +# TAG: dns_nameservers +# Use this if you want to specify a list of DNS name servers +# (IP addresses) to use instead of those given in your +# /etc/resolv.conf file. +# On Windows platforms, if no value is specified here or in +# the /etc/resolv.conf file, the list of DNS name servers are +# taken from the Windows registry, both static and dynamic DHCP +# configurations are supported. +# +# Example: dns_nameservers 10.0.0.1 192.172.0.4 +#Default: +# none + +# TAG: hosts_file +# Location of the host-local IP name-address associations +# database. Most Operating Systems have such a file on different +# default locations: +# - Un*X & Linux: /etc/hosts +# - Windows NT/2000: %SystemRoot%\system32\drivers\etc\hosts +# (%SystemRoot% value install default is c:\winnt) +# - Windows XP/2003: %SystemRoot%\system32\drivers\etc\hosts +# (%SystemRoot% value install default is c:\windows) +# - Windows 9x/Me: %windir%\hosts +# (%windir% value is usually c:\windows) +# - Cygwin: /etc/hosts +# +# The file contains newline-separated definitions, in the +# form ip_address_in_dotted_form name [name ...] names are +# whitespace-separated. Lines beginning with an hash (#) +# character are comments. +# +# The file is checked at startup and upon configuration. +# If set to 'none', it won't be checked. +# If append_domain is used, that domain will be added to +# domain-local (i.e. not containing any dot character) host +# definitions. +#Default: +# hosts_file /etc/hosts + +# TAG: append_domain +# Appends local domain name to hostnames without any dots in +# them. append_domain must begin with a period. +# +# Be warned there are now Internet names with no dots in +# them using only top-domain names, so setting this may +# cause some Internet sites to become unavailable. +# +#Example: +# append_domain .yourdomain.com +#Default: +# none + +# TAG: ignore_unknown_nameservers +# By default Squid checks that DNS responses are received +# from the same IP addresses they are sent to. If they +# don't match, Squid ignores the response and writes a warning +# message to cache.log. You can allow responses from unknown +# nameservers by setting this option to 'off'. +#Default: +# ignore_unknown_nameservers on + +# TAG: dns_v4_fallback +# Standard practice with DNS is to lookup either A or AAAA records +# and use the results if it succeeds. Only looking up the other if +# the first attempt fails or otherwise produces no results. +# +# That policy however will cause squid to produce error pages for some +# servers that advertise AAAA but are unreachable over IPv6. +# +# If this is ON squid will always lookup both AAAA and A, using both. +# If this is OFF squid will lookup AAAA and only try A if none found. +# +# WARNING: There are some possibly unwanted side-effects with this on: +# *) Doubles the load placed by squid on the DNS network. +# *) May negatively impact connection delay times. +#Default: +# dns_v4_fallback on + +# TAG: ipcache_size (number of entries) +# TAG: ipcache_low (percent) +# TAG: ipcache_high (percent) +# The size, low-, and high-water marks for the IP cache. +#Default: +# ipcache_size 1024 +# ipcache_low 90 +# ipcache_high 95 + +# TAG: fqdncache_size (number of entries) +# Maximum number of FQDN cache entries. +#Default: +# fqdncache_size 1024 + +# MISCELLANEOUS +# ----------------------------------------------------------------------------- + +# TAG: memory_pools on|off +# If set, Squid will keep pools of allocated (but unused) memory +# available for future use. If memory is a premium on your +# system and you believe your malloc library outperforms Squid +# routines, disable this. +#Default: +# memory_pools on + +# TAG: memory_pools_limit (bytes) +# Used only with memory_pools on: +# memory_pools_limit 50 MB +# +# If set to a non-zero value, Squid will keep at most the specified +# limit of allocated (but unused) memory in memory pools. All free() +# requests that exceed this limit will be handled by your malloc +# library. Squid does not pre-allocate any memory, just safe-keeps +# objects that otherwise would be free()d. Thus, it is safe to set +# memory_pools_limit to a reasonably high value even if your +# configuration will use less memory. +# +# If set to none, Squid will keep all memory it can. That is, there +# will be no limit on the total amount of memory used for safe-keeping. +# +# To disable memory allocation optimization, do not set +# memory_pools_limit to 0 or none. Set memory_pools to "off" instead. +# +# An overhead for maintaining memory pools is not taken into account +# when the limit is checked. This overhead is close to four bytes per +# object kept. However, pools may actually _save_ memory because of +# reduced memory thrashing in your malloc library. +#Default: +# memory_pools_limit 5 MB + +# TAG: forwarded_for on|off|transparent|truncate|delete +# If set to "on", Squid will append your client's IP address +# in the HTTP requests it forwards. By default it looks like: +# +# X-Forwarded-For: 192.1.2.3 +# +# If set to "off", it will appear as +# +# X-Forwarded-For: unknown +# +# If set to "transparent", Squid will not alter the +# X-Forwarded-For header in any way. +# +# If set to "delete", Squid will delete the entire +# X-Forwarded-For header. +# +# If set to "truncate", Squid will remove all existing +# X-Forwarded-For entries, and place itself as the sole entry. +#Default: +# forwarded_for on + +# TAG: cachemgr_passwd +# Specify passwords for cachemgr operations. +# +# Usage: cachemgr_passwd password action action ... +# +# Some valid actions are (see cache manager menu for a full list): +# 5min +# 60min +# asndb +# authenticator +# cbdata +# client_list +# comm_incoming +# config * +# counters +# delay +# digest_stats +# dns +# events +# filedescriptors +# fqdncache +# histograms +# http_headers +# info +# io +# ipcache +# mem +# menu +# netdb +# non_peers +# objects +# offline_toggle * +# pconn +# peer_select +# reconfigure * +# redirector +# refresh +# server_list +# shutdown * +# store_digest +# storedir +# utilization +# via_headers +# vm_objects +# +# * Indicates actions which will not be performed without a +# valid password, others can be performed if not listed here. +# +# To disable an action, set the password to "disable". +# To allow performing an action without a password, set the +# password to "none". +# +# Use the keyword "all" to set the same password for all actions. +# +#Example: +# cachemgr_passwd secret shutdown +# cachemgr_passwd lesssssssecret info stats/objects +# cachemgr_passwd disable all +#Default: +# none + +# TAG: client_db on|off +# If you want to disable collecting per-client statistics, +# turn off client_db here. +#Default: +# client_db on + +# TAG: refresh_all_ims on|off +# When you enable this option, squid will always check +# the origin server for an update when a client sends an +# If-Modified-Since request. Many browsers use IMS +# requests when the user requests a reload, and this +# ensures those clients receive the latest version. +# +# By default (off), squid may return a Not Modified response +# based on the age of the cached version. +#Default: +# refresh_all_ims off + +# TAG: reload_into_ims on|off +# When you enable this option, client no-cache or ``reload'' +# requests will be changed to If-Modified-Since requests. +# Doing this VIOLATES the HTTP standard. Enabling this +# feature could make you liable for problems which it +# causes. +# +# see also refresh_pattern for a more selective approach. +#Default: +# reload_into_ims off + +# TAG: maximum_single_addr_tries +# This sets the maximum number of connection attempts for a +# host that only has one address (for multiple-address hosts, +# each address is tried once). +# +# The default value is one attempt, the (not recommended) +# maximum is 255 tries. A warning message will be generated +# if it is set to a value greater than ten. +# +# Note: This is in addition to the request re-forwarding which +# takes place if Squid fails to get a satisfying response. +#Default: +# maximum_single_addr_tries 1 + +# TAG: retry_on_error +# If set to on Squid will automatically retry requests when +# receiving an error response. This is mainly useful if you +# are in a complex cache hierarchy to work around access +# control errors. +#Default: +# retry_on_error off + +# TAG: as_whois_server +# WHOIS server to query for AS numbers. NOTE: AS numbers are +# queried only when Squid starts up, not for every request. +#Default: +# as_whois_server whois.ra.net + +# TAG: offline_mode +# Enable this option and Squid will never try to validate cached +# objects. +#Default: +# offline_mode off + +# TAG: uri_whitespace +# What to do with requests that have whitespace characters in the +# URI. Options: +# +# strip: The whitespace characters are stripped out of the URL. +# This is the behavior recommended by RFC2396. +# deny: The request is denied. The user receives an "Invalid +# Request" message. +# allow: The request is allowed and the URI is not changed. The +# whitespace characters remain in the URI. Note the +# whitespace is passed to redirector processes if they +# are in use. +# encode: The request is allowed and the whitespace characters are +# encoded according to RFC1738. This could be considered +# a violation of the HTTP/1.1 +# RFC because proxies are not allowed to rewrite URI's. +# chop: The request is allowed and the URI is chopped at the +# first whitespace. This might also be considered a +# violation. +#Default: +# uri_whitespace strip + +# TAG: chroot +# Specifies a directory where Squid should do a chroot() while +# initializing. This also causes Squid to fully drop root +# privileges after initializing. This means, for example, if you +# use a HTTP port less than 1024 and try to reconfigure, you may +# get an error saying that Squid can not open the port. +#Default: +# none + +# TAG: balance_on_multiple_ip +# Modern IP resolvers in squid sort lookup results by preferred access. +# By default squid will use these IP in order and only rotates to +# the next listed when the most preffered fails. +# +# Some load balancing servers based on round robin DNS have been +# found not to preserve user session state across requests +# to different IP addresses. +# +# Enabling this directive Squid rotates IP's per request. +#Default: +# balance_on_multiple_ip off + +# TAG: pipeline_prefetch +# To boost the performance of pipelined requests to closer +# match that of a non-proxied environment Squid can try to fetch +# up to two requests in parallel from a pipeline. +# +# Defaults to off for bandwidth management and access logging +# reasons. +# +# WARNING: pipelining breaks NTLM and Negotiate/Kerberos authentication. +#Default: +# pipeline_prefetch off + +# TAG: high_response_time_warning (msec) +# If the one-minute median response time exceeds this value, +# Squid prints a WARNING with debug level 0 to get the +# administrators attention. The value is in milliseconds. +#Default: +# high_response_time_warning 0 + +# TAG: high_page_fault_warning +# If the one-minute average page fault rate exceeds this +# value, Squid prints a WARNING with debug level 0 to get +# the administrators attention. The value is in page faults +# per second. +#Default: +# high_page_fault_warning 0 + +# TAG: high_memory_warning +# If the memory usage (as determined by mallinfo) exceeds +# this amount, Squid prints a WARNING with debug level 0 to get +# the administrators attention. +#Default: +# high_memory_warning 0 KB + +# TAG: sleep_after_fork (microseconds) +# When this is set to a non-zero value, the main Squid process +# sleeps the specified number of microseconds after a fork() +# system call. This sleep may help the situation where your +# system reports fork() failures due to lack of (virtual) +# memory. Note, however, if you have a lot of child +# processes, these sleep delays will add up and your +# Squid will not service requests for some amount of time +# until all the child processes have been started. +# On Windows value less then 1000 (1 milliseconds) are +# rounded to 1000. +#Default: +# sleep_after_fork 0 + +# TAG: windows_ipaddrchangemonitor on|off +# On Windows Squid by default will monitor IP address changes and will +# reconfigure itself after any detected event. This is very useful for +# proxies connected to internet with dial-up interfaces. +# In some cases (a Proxy server acting as VPN gateway is one) it could be +# desiderable to disable this behaviour setting this to 'off'. +# Note: after changing this, Squid service must be restarted. +#Default: +# windows_ipaddrchangemonitor on + +# TAG: max_filedescriptors +# The maximum number of filedescriptors supported. +# +# The default "0" means Squid inherits the current ulimit setting. +# +# Note: Changing this requires a restart of Squid. Also +# not all comm loops supports large values. +#Default: +# max_filedescriptors 0 + |