[crliao]

Motivation and Context

• A request with no body is sent over HTTP/2 as a HEADERS frame followed by an empty DATA frame that ends the stream.
• The server can send its full response and then reset the stream with RST_STREAM NO_ERROR before that empty DATA frame goes out. RFC 9113 §8.1 allows this.
• The client then fails a request whose response it already received.

Modifications

• HttpToHttp2OutboundAdapter: bodyless requests now end the stream on the HEADERS frame, so no empty DATA frame is sent.
• NettyRequestExecutor: a write failure that happens after the response has already completed successfully is now ignored.
• Existing tests were updated to expect END_STREAM on HEADERS: H2ServerErrorTest, PingTimeoutTest, ServerCloseConnectionTest, ServerNotRespondingTest, WindowSizeTest and HttpToHttp2OutboundAdapterTest.
• New EarlyResponseResetTest with 14 cases.
• A changelog entry was added under .changes/next-release.

Testing

• The netty-nio-client module builds and its test suite passes on the branch, including the 14 new tests.

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance improvement (non-breaking change which improves latency, throughput, or resource use)
• Deprecation (marks existing functionality as deprecated)
• Removal (removes previously deprecated functionality)
• Documentation (changes to documentation only)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

AI tools

• I wrote this pull request description myself, not with an AI tool
• I have reviewed all changes in this pull request myself, including any generated by AI tools

License

• I confirm that this pull request can be released under the Apache 2 license