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28 lines
967 B
Makefile
28 lines
967 B
Makefile
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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See-also: http1.1 http2
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Category: http
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Example: --http3 $URL
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Multi: mutex
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Experimental: yes
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---
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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 will issue 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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will still try to proceed with an older HTTP version.
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Use --http3-only for similar functionality *without* a fallback.
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