Disable HTTP/3 when HTTP proxy is used#12699
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Seldaek merged 2 commits intocomposer:mainfrom Dec 30, 2025
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HTTP/3 support for proxies seems possible, so ideally we shouldn't have to do this, but I guess it's too early so probably rather keep this off for now.. |
nicolas-grekas
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This PR was merged into the 7.3 branch. Discussion ---------- [HttpClient] Skip HTTP/3 when using a proxy | Q | A | ------------- | --- | Branch? | 7.3 | Bug fix? | yes | New feature? | no | Deprecations? | no | Issues | - | License | MIT We enabled enabling HTTP/3 in #59370 But I also just learned about composer/composer#12699 I think we should do the same. HTTP/3 + proxies are not yet there, let's play safe. Commits ------- 44e6ee7 [HttpClient] Skip HTTP/3 when using a proxy
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HTTP/3 is not supported over an HTTP proxy. This change adds a check to detect when a proxy will be used for a request and falls back to HTTP/2 instead of attempting to use HTTP/3, preventing connection errors.