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