curl/docs/cmdline-opts/http3-only.md
Daniel Stenberg 2494b8dd51
docs/cmdline: change to .md for cmdline docs
- switch all invidual files documenting command line options into .md,
   as the documentation is now markdown-looking.

 - made the parser treat 4-space indents as quotes

 - switch to building the curl.1 manpage using the "mainpage.idx" file,
   which lists the files to include to generate it, instead of using the
   previous page-footer/headers. Also, those files are now also .md
   ones, using the same format. I gave them underscore prefixes to make
   them sort separately:
   _NAME.md, _SYNOPSIS.md, _DESCRIPTION.md, _URL.md, _GLOBBING.md,
   _VARIABLES.md, _OUTPUT.md, _PROTOCOLS.md, _PROGRESS.md, _VERSION.md,
   _OPTIONS.md, _FILES.md, _ENVIRONMENT.md, _PROXYPREFIX.md,
   _EXITCODES.md, _BUGS.md, _AUTHORS.md, _WWW.md, _SEEALSO.md

 - updated test cases accordingly

Closes #12751
2024-01-23 14:30:15 +01:00

33 lines
914 B
Markdown

---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Long: http3-only
Tags: Versions
Protocols: HTTP
Added: 7.88.0
Mutexed: http1.1 http1.0 http2 http2-prior-knowledge http3
Requires: HTTP/3
Help: Use HTTP v3 only
Category: http
Multi: mutex
See-also:
- http1.1
- http2
- http3
Example:
- --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.