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curl/docs/cmdline-opts/no-npn.d

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+Long: no-npn
+Tags: Versions HTTP/2
+Protocols: HTTPS
+Added: 7.36.0
+Mutexed:
+See-also: no-alpn http2
+Requires: TLS
+Help: Disable the NPN TLS extension
+Category: tls http
+---
+Disable the NPN TLS extension. NPN is enabled by default if libcurl was built
+with an SSL library that supports NPN. NPN is used by a libcurl that supports
+HTTP/2 to negotiate HTTP/2 support with the server during https sessions.