curl-quic is a version of curl which supports QUIC and HTTP/3 This version is identical to curl provided by Slackware, but supports QUIC and HTTP/3 via nghttp3 and ngtcp2 found on SBo. ECH is still not supported. Test that QUIC works by curl-quic -v --http3-only https://cloudflare-quic.com or any other QUIC-enabled website.