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curl
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: --- 9: Disable the ALPN TLS extension. ALPN is enabled by default if libcurl was built 10: with an SSL library that supports ALPN. ALPN is used by a libcurl that supports 11: HTTP/2 to negotiate HTTP/2 support with the server during https sessions.