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curl/docs/cmdline-opts/http3-only.md
Daniel Stenberg aa18891dda
docs/cmdline-opts: unify HTTP version style in --help output 
$ curl -h all | grep -- --http

Now:

     --http0.9                      Allow HTTP/0.9 responses
 -0, --http1.0                      Use HTTP/1.0
     --http1.1                      Use HTTP/1.1
     --http2                        Use HTTP/2
     --http2-prior-knowledge        Use HTTP/2 without HTTP/1.1 Upgrade
     --http3                        Use HTTP/3
     --http3-only                   Use HTTP/3 only

Before:

     --http0.9                      Allow HTTP 0.9 responses
 -0, --http1.0                      Use HTTP 1.0
     --http1.1                      Use HTTP 1.1
     --http2                        Use HTTP/2
     --http2-prior-knowledge        Use HTTP 2 without HTTP/1.1 Upgrade
     --http3                        Use HTTP v3
     --http3-only                   Use HTTP v3 only

Closes #16542
2025-03-03 23:09:19 +01:00

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c SPDX-License-Identifier Long Tags Protocols Added Mutexed Requires Help Category Multi See-also Example
Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. curl http3-only Versions HTTP 7.88.0 http1.1 http1.0 http2 http2-prior-knowledge http3 HTTP/3 Use HTTP/3 only http mutex
http1.1
http2
http3
--http3-only $URL

--http3-only

Instructs curl to use HTTP/3 to the host in the URL, with no fallback to earlier HTTP versions. HTTP/3 can only be used for HTTPS and not for HTTP URLs. For HTTP, this option triggers an error.

This option allows a user to avoid using the Alt-Svc method of upgrading to HTTP/3 when you know that the target speaks HTTP/3 on the given host and port.

This option makes curl fail if a QUIC connection cannot be established, it does not attempt any other HTTP versions on its own. Use --http3 for similar functionality with a fallback.