This Heads-Up is part of the regular communication sent to the projects involved; it covers the HTTP/3 support in JDK 26.

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JDK 26 introduces HTTP/3 support to Java's HttpClient API, built on the QUIC protocol over UDP instead of TCP. Developers can enable HTTP/3 by setting it as the preferred version on HttpClient or HttpRequest instances. The implementation automatically downgrades to HTTP/2 or HTTP/1.1 if the server doesn't support HTTP/3. The HttpClient can discover HTTP/3 support through mechanisms like HTTP Alternative Services headers, allowing subsequent requests to use the preferred protocol. Early access builds are available for testing and feedback.

JDK 26: HTTP/3 Support – Inside.java