Update puma 6.6.0 → 6.6.1 (patch)

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ puma (6.6.0 → 6.6.1) · Repo · Changelog

Release Notes

6.6.1

6.6.1 / 2025-07-30

• Bugfixes
  • Accept to_path to be nil on request bodies ([#3635])
  • Fix single runner stats before the server start ([#3572])
  • Fix incomplete worker boot state on refork ([#3601])
  • Improve HttpParserError messages for better debugging ([#3586])
  • Fix refork logs to distinguish from phased restarts ([#3598])
  • Fix rack.after_reply so it doesn't interrupt chain on error ([#3680])

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 29 commits:

• v6.6.1 (#3679)
• `rack.after_reply` don't interrupt chain on error (#3680)
• Fix variable typo: stategy > strategy (#3669)
• CI: make `WEB_CONCURRENCY=auto` test pass on single core systems (#3665)
• Add '# frozen_string_literal: true' to all test files (#3663)
• Address rubocop plugin warning (#3661)
• ci: Fix Gemfiles for cgi removal in ruby head (#3656)
• bug: Accept `to_path` to be `nil` on request bodies (#3635)
• Link to official Ruby documentation (#3653)
• Update docs to show correct default value for worker_shutdown_timeout (#3652)
• Update Nate scheduling link [ci skip]
• Fix Dockerfile and bug_report.md (#3641)
• [CI] GHA workflows - remove Ubuntu 20.04 (#3649)
• Gemfile - add fiddle for Windows Ruby >= 3.5 (#3637)
• [CI] test.yml - allow non-MRI failure on compile (#3636)
• Fix single runner stats before the server start (#3572)
• Remove unused global $debugging_hold in test helper (#3614)
• CI: test_puma_server_ssl.rb -fix for `set_minmax_proto_version` removal (#3615)
• Update 'clustered mode' references to 'cluster mode' (#3613)
• Refactor `HttpParserError` handling, add `test/test_request_single.rb` (#3586)
• Remove DSL version comments, note fork_worker as experimental (#3611)
• Fix GHA badge in README.md [ci skip] (#3612)
• Remove redundant signal exists guards in tests (#3610)
• Update refork logs (#3598)
• CI: test_launcher.rb - move `test_puma_stats_clustered` to test_integration_clustered.rb (#3609)
• Fix incomplete worker boot state on refork (#3601)
• CI: integration.rb - catch Errno::EBADF in restart thread (#3608)
• CI: test/test_request_invalid.rb - fix macOS TruffleRuby failures (#3607)
• CI: test/helper.rb - place timeout checks inside Minitest capture_exceptions (#3606)

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