RFR: 8349910: Implement JEP 517: HTTP/3 for the HTTP Client API [v11]

[Daniel Jeliński]

On Tue, 8 Jul 2025 14:04:56 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 550 commits:
> 
>  - merge latest changes from master branch
>  - http3: fix new HttpHeadersBuilder constructor
>  - qpack - optimize processing of decoder instruction exceptions
>  - http3/quic: update the code to use the newly introduced jdk.internal.net.http.Origin
>  - Avoid speculating about the future in TODOs
>  - http3: rename PacketSpaceManager::isAcknowledging to PacketSpaceManager::trackAcknowledgement
>  - merge latest changes from master branch
>  - http3: fix typo in UniStreamPair.java
>  - WriterQueue may leak before the constructor completes
>  - Limit the number of retries in H3UserInfoTest
>  - ... and 540 more: https://git.openjdk.org/jdk/compare/7b255b8a...f0a4fd3d

src/java.net.http/share/classes/jdk/internal/net/http/AltSvcProcessor.java line 164:

> 162:             // serialized form of an origin (defined in section 6.2 of RFC-6454)
> 163:             try {
> 164:                 origin = Origin.fromASCIISerializedForm(frame.getOrigin());

Do we check if the origin is authoritative before processing the alt service? I don't see that here

src/java.net.http/share/classes/jdk/internal/net/http/Exchange.java line 419:

> 417:                 .thenApply((eimpl) -> {synchronized (Exchange.this) {exchImpl = eimpl;}
> 418:                     checkCancelled(); return eimpl; })
> 419:                 .thenApply(Function.identity());

Suggestion:

                .copy();

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PR Review Comment: https://git.openjdk.org/jdk/pull/24751#discussion_r2210059133
PR Review Comment: https://git.openjdk.org/jdk/pull/24751#discussion_r2209566030