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- 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
- See-also: http1.1 http2 http3
- Category: http
- Example: --http3-only $URL
- Multi: mutex
- Experimental: yes
- ---
- 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 will trigger 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 will make curl fail if a QUIC connection cannot be established, it
- will not attempt any other HTTP version on its own. Use --http3 for similar
- functionality *with* a fallback.
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