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http2-prior-knowledge.md

http2-prior-knowledge.md 853 B
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c: Copyright (C) Daniel Stenberg, daniel@haxx.se, et al. SPDX-License-Identifier: curl Long: http2-prior-knowledge Tags: Versions Protocols: HTTP Added: 7.49.0 Mutexed: http1.1 http1.0 http2 http3 Requires: HTTP/2 Help: Use HTTP 2 without HTTP/1.1 Upgrade Category: http Multi: boolean See-also:

  • http2
  • http3 Example:
  • --http2-prior-knowledge $URL ---

--http2-prior-knowledge

Issue a non-TLS HTTP requests using HTTP/2 directly without HTTP/1.1 Upgrade. It requires prior knowledge that the server supports HTTP/2 straight away. HTTPS requests still do HTTP/2 the standard way with negotiated protocol version in the TLS handshake.

Since 8.10.0 if this option is set for an HTTPS request then the application layer protocol version (ALPN) offered to the server is only HTTP/2. Prior to that both HTTP/1.1 and HTTP/2 were offered.