RFR: 8349910: Implement HTTP/3 for the HTTP Client API [v2]

[Artur Barashev]

On Thu, 24 Apr 2025 16:59:45 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Hi,
>> 
>> Please find here a PR for the implementation of JEP [JDK-8291976: HTTP/3 for the HTTP Client API](https://bugs.openjdk.org/browse/JDK-8291976).
>> 
>> The CSR can be viewed at [JDK-8350588: Implement 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 409 commits:
> 
>  - merge latest changes from master branch
>  - http3: add missing <p> separator to Http3DiscoveryMode.ALT_SVC API documentation
>  - http3: improve documentation for Http3DiscoveryMode.ALT_SVC
>  - http3: Use AlgorithmConstraints and OCSP responses when validating server certificate during QUIC TLS handshake
>  - http3: Artur's review - use SecurityUtils.removeFromDisabledTlsAlgs() in test
>  - http3: minor improvement to log message
>  - http3: Artur's review - remove commented out code from test
>  - http3: Artur's review - make methods package private
>  - http3: qpack - allow 0 capacity when max capacity is 0
>  - Remove flow control from stream limit comments
>  - ... and 399 more: https://git.openjdk.org/jdk/compare/1ec64811...4da61bbe

src/java.base/share/classes/sun/security/ssl/X509TrustManagerImpl.java line 275:

> 273:         final X509Certificate[] trustedChain = v.validate(chain, null,
> 274:                 responseList, constraints, authType);
> 275:         if (sslParameters != null && handshakeSession != null) {

Looks like this `if` block is not needed: `sslParameters != null` condition is always `true`, and we should throw an exception in the beginning of the method if session is null.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24751#discussion_r2060782742