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