RFR: 8349910: Implement JEP 517: HTTP/3 for the HTTP Client API [v18]

[Michael McMahon]

On Wed, 17 Sep 2025 16:58:04 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 659 commits:
> 
>  - merge latest changes from master branch
>  - merge latest changes from master branch
>  - http3: CSR review feedback
>  - merge latest changes from master branch
>  - modify http3 test timeouts
>  - qpack - take knownReceivedCount into account during DT entries eviction
>  - merge latest changes from master branch
>  - http3: fix at since
>  - merge latest http3 changes
>  - Remove unused variables
>  - ... and 649 more: https://git.openjdk.org/jdk/compare/9949ee31...5409bdeb

I have reviewed the version independent changes only. They look fine to me.

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Marked as reviewed by michaelm (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24751#pullrequestreview-3244405763