RFR: 8349910: Implement JEP 517: HTTP/3 for the HTTP Client API [v5]

[Artur Barashev]

On Fri, 9 May 2025 14:39:53 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Hi,
>> 
>> Please find here a PR for the implementation of [JEP 517: HTTP/3 for the HTTP Client API](https://openjdk.org/jeps/517).
>> 
>> The CSR can be viewed at [JDK-8350588: Implement JEP 517: HTTP/3 for the HTTP Client API](https://bugs.openjdk.org/browse/JDK-8350588)
>> 
>> This JEP proposes to enhance the HttpClient implementation to support HTTP/3.
>> It adds a non-exposed / non-exported internal implementation of the QUIC protocol based on DatagramChannel and the SunJSSE SSLContext provider.
>
> Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 422 commits:
> 
>  - merge latest changes from master branch
>  - Undo whitespace change
>  - Remove unnecessary import
>  - Merge remote-tracking branch 'origin/master' into http3
>  - Fix test license
>  - Remove leftover file (test was moved to parent directory)
>  - Remove unnecessary import
>  - Update throws clauses
>  - Merge remote-tracking branch 'origin/master' into http3
>  - 8354275: Add HTTP/3 tests to `EmptyAuthenticate`
>  - ... and 412 more: https://git.openjdk.org/jdk/compare/568dcc15...8c27f53c

@seanjmullan @djelinski We should probably re-evaluate the priority of `TLS Certificate Compression` JEP:
https://bugs.openjdk.org/browse/JDK-8281710

Certificate compression seems to be [particularly important for QUIC performance](https://www.fastly.com/blog/quic-handshake-tls-compression-certificates-extension-study), the work has been started already in #7599

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PR Comment: https://git.openjdk.org/jdk/pull/24751#issuecomment-2886849963