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no-npn.md

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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: no-npn Tags: Versions HTTP/2 Protocols: HTTPS Added: 7.36.0 Mutexed: Requires: TLS Help: Disable the NPN TLS extension Category: tls http Multi: boolean See-also:

  • no-alpn
  • http2 Example:
  • --no-npn $URL ---

--no-npn

curl never uses NPN, this option has no effect (added in 7.86.0).

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.