RFR: 8349910: Implement JEP 517: HTTP/3 for the HTTP Client API [v9]

[Daniel Jeliński]

On Thu, 26 Jun 2025 16:36:40 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 525 commits:
> 
>  - merge latest changes from master branch
>  - http3: run H3StreamLimitReachedTest.java with -Djdk.httpclient.http3.maxStreamLimitTimeout=0 too
>  - retry the ResetControlStream test as needed
>  - http3: fix pending connection and reconnection on stream limit reached logic
>  - http3: pending acknowledgement should be registered before actually sending the packet
>  - http3: fix race with ping requests in PacketSpaceManager.java causing intermittent failures in H3ErrorHandlingTest.java
>  - http3: improve exceptions in Http3ServerExchange.java
>  - http3: fix exception handling in CancelRequestTest.java
>  - http3: review feedback - revert HPACK.java
>  - Implement X509TrustManagerImpl#checkClientTrusted for QUIC
>  - ... and 515 more: https://git.openjdk.org/jdk/compare/5a1301df...0229c215

src/java.net.http/share/classes/jdk/internal/net/http/Exchange.java line 124:

> 122:     // exchange so that it can be aborted/timed out mid setup.
> 123:     final class ConnectionAborter {
> 124:         // In case of HTTP/3 direct connection we may have

"direct" is usually used to refer to connections that don't use a proxy; since H3 connections never use a proxy, can we drop the "direct" here?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24751#discussion_r2174648431