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Support trailers in chunked publisher #6264

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@dagnir dagnir commented Jul 16, 2025

This commit adds support adding the trailer-part of the chunked encoded format.

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  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)

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  • 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

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

This commit adds support adding the `trailer-part` of the chunked
encoded format.
@dagnir dagnir marked this pull request as ready for review July 16, 2025 18:14
@dagnir dagnir requested a review from a team as a code owner July 16, 2025 18:14
@dagnir dagnir added the changelog-not-required Indicate changelog entry is not required for a specific PR label Jul 16, 2025
trailerData = Collections.emptyList();
}

int trailerLen = trailerData.stream().mapToInt(t -> t.remaining() + 2).sum();
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Why +2 ?

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Each trailer ends with \r\n. I'll add a comment

@zoewangg zoewangg requested a review from Copilot July 18, 2025 16:41
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Pull Request Overview

This PR implements support for HTTP trailer headers in the chunked encoding publisher, following the RFC 7230 specification. The chunked encoding format now includes the trailer-part section that allows appending additional headers after the chunked data.

  • Adds trailer provider functionality to append headers to the end of chunked streams
  • Implements proper formatting of trailer headers with support for multiple values
  • Ensures trailers are only added to the final empty chunk (chunk size 0)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File Description
ChunkedEncodedPublisher.java Core implementation of trailer support including provider management and proper formatting
ChunkedEncodedPublisherTest.java Comprehensive test coverage for trailer functionality including edge cases and validation

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