libcurl supports HTTP alternative services (aka Alt-Svc). This feature is required for HTTP/3 communication using libcurl. https://everything.curl.dev/libcurl-http/alt-svc https://everything.curl.dev/http/http3 So, we will add support for Alt-Svc to support HTTP/3 on the curl port in the future.
Pull request: https://github.com/WebKit/WebKit/pull/12404
<rdar://problem/107918381>
Committed 263214@main (2162ae8bd604): <https://commits.webkit.org/263214@main> Reviewed commits have been landed. Closing PR #12404 and removing active labels.