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aa18891dda
curl-curl/docs/cmdline-opts/http3.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 Versions HTTP 7.66.0 http1.1 http1.0 http2 http2-prior-knowledge http3-only HTTP/3 Use HTTP/3 http mutex
http1.1
http2
--http3 $URL

--http3

Attempt HTTP/3 to the host in the URL, but fallback to earlier HTTP versions if the HTTP/3 connection establishment fails or is slow. HTTP/3 is only available for HTTPS and not for HTTP URLs.

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

When asked to use HTTP/3, curl issues a separate attempt to use older HTTP versions with a slight delay, so if the HTTP/3 transfer fails or is slow, curl still tries to proceed with an older HTTP version. The fallback performs the regular negotiation between HTTP/1 and HTTP/2.

Use --http3-only for similar functionality without a fallback.