2494b8dd51
- 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
34 lines
972 B
Markdown
34 lines
972 B
Markdown
---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Long: http3
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Tags: Versions
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Protocols: HTTP
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Added: 7.66.0
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Mutexed: http1.1 http1.0 http2 http2-prior-knowledge http3-only
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Requires: HTTP/3
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Help: Use HTTP v3
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Category: http
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Multi: mutex
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See-also:
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- http1.1
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- http2
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Example:
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- --http3 $URL
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---
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# `--http3`
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Tells curl to try HTTP/3 to the host in the URL, but fallback to earlier
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HTTP versions if the HTTP/3 connection establishment fails. HTTP/3 is only
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available for HTTPS and not for HTTP URLs.
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This option allows a user to avoid using the Alt-Svc method of upgrading to
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HTTP/3 when you know that the target speaks HTTP/3 on the given host and port.
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When asked to use HTTP/3, curl issues a separate attempt to use older HTTP
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versions with a slight delay, so if the HTTP/3 transfer fails or is slow, curl
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still tries to proceed with an older HTTP version.
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Use --http3-only for similar functionality *without* a fallback.
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