1 Long: no-alpn 2 Tags: HTTP/2 3 Protocols: HTTPS 4 Added: 7.36.0 5 See-also: no-npn http2 6 Requires: TLS 7 Help: Disable the ALPN TLS extension 8 Category: tls http 9 --- 10 Disable the ALPN TLS extension. ALPN is enabled by default if libcurl was built 11 with an SSL library that supports ALPN. ALPN is used by a libcurl that supports 12 HTTP/2 to negotiate HTTP/2 support with the server during https sessions. 13