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- c: Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
- SPDX-License-Identifier: curl
- Long: http3
- Tags: Versions
- Protocols: HTTP
- Added: 7.66.0
- Mutexed: http1.1 http1.0 http2 http2-prior-knowledge
- Requires: HTTP/3
- Help: Use HTTP v3
- See-also: http1.1 http2
- Category: http
- Example: --http3 $URL
- ---
- **WARNING**: this option is experimental. Do not use in production.
- Tells curl to use HTTP version 3 directly to the host and port number used in
- the URL. A normal HTTP/3 transaction will be done to a host and then get
- redirected via Alt-Svc, but this option allows a user to circumvent that when
- you know that the target speaks HTTP/3 on the given host and port.
- This option will make curl fail if a QUIC connection cannot be established, it
- cannot fall back to a lower HTTP version on its own.
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