1 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 2 SPDX-License-Identifier: curl 3 Long: no-npn 4 Tags: Versions HTTP/2 5 Protocols: HTTPS 6 Added: 7.36.0 7 Mutexed: 8 See-also: no-alpn http2 9 Requires: TLS 10 Help: Disable the NPN TLS extension 11 Category: tls http 12 Example: --no-npn $URL 13 Multi: boolean 14 --- 15 curl never uses NPN, this option has no effect (added in 7.86.0). 16 17 Disable the NPN TLS extension. NPN is enabled by default if libcurl was built 18 with an SSL library that supports NPN. NPN is used by a libcurl that supports 19 HTTP/2 to negotiate HTTP/2 support with the server during https sessions. 20