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-rw-r--r--youtube_dl/utils.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index 25bd228ab..911cacd29 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2110,7 +2110,7 @@ def try_multipart_encode(data, boundary):
v = v.encode('utf-8')
# RFC 2047 requires non-ASCII field names to be encoded, while RFC 7578
# suggests sending UTF-8 directly. Firefox sends UTF-8, too
- content = b'Content-Disposition: form-data; name="%s"\r\n\r\n' % k + v + b'\r\n'
+ content = b'Content-Disposition: form-data; name="' + k + b'"\r\n\r\n' + v + b'\r\n'
if boundary.encode('ascii') in content:
raise ValueError('Boundary overlaps with data')
out += content