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Changelog

All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference Keep A Changelog.

Unreleased

SPEC Changes

• Define rack.response_finished callback arguments more strictly. (#2365, @​skipkayhil)

Added

• Add support for rack.response_finished to Rack::TempfileReaper. (#2363, @​skipkayhil)
• Add support for streaming bodies when using Rack::Events. (#2375, @​unflxw)

Changed

• Raise before exceeding a part limit, not after. (#2362, @​matthew-puku)

Fixed

• Fix an issue where a NoMethodError would be raised when using Rack::Events with streaming bodies. (#2375, @​unflxw)

[3.2.0] - 2025-07-31

This release continues Rack's evolution toward a cleaner, more efficient foundation while maintaining backward compatibility for most applications. The breaking changes primarily affect deprecated functionality, so most users should experience a smooth upgrade with improved performance and standards compliance.

SPEC Changes

• Request environment keys must now be strings. (#2310, [@​jeremyevans])
• Add nil as a valid return from a Response body.to_path (#2318, [@​MSP-Greg])
• Rack::Lint#check_header_value is relaxed, only disallowing CR/LF/NUL characters. (#2354, [@​ioquatix])

Added

• Introduce Rack::VERSION constant. (#2199, [@​ioquatix])
• ISO-2022-JP encoded parts within MIME Multipart sections of an HTTP request body will now be converted to UTF-8. (#2245, @​nappa)
• Add Rack::Request#query_parser= to allow setting the query parser to use. (#2349, [@​jeremyevans])
• Add Rack::Request#form_pairs to access form data as raw key-value pairs, preserving duplicate keys. (#2351, [@​matthewd])

Changed

• Invalid cookie keys will now raise an error. (#2193, [@​ioquatix])
• Rack::MediaType#params now handles empty strings. (#2229, [@​jeremyevans])
• Avoid unnecessary calls to the ip_filter lambda to evaluate Request#ip (#2287, [@​willbryant])
• Only calculate Request#ip once per request (#2292, [@​willbryant])
• Rack::Builder #use, #map, and #run methods now return nil. (#2355, [@​ioquatix])
• Directly close the body in Rack::ConditionalGet when the response is 304 Not Modified. (#2353, [@​ioquatix])
• Directly close the body in Rack::Head when the request method is HEAD(#2360, @​skipkayhil)

... (truncated)

• 14c8731 Bump patch version.
• 7ea1f40 Support streaming bodies when using Rack::Events. (#2375)
• b68251c Bump minor version.
• a6ba717 Minor updates to README and CHANGELOG.
• 9e10390 Directly close the body in Rack::Head. (#2360)
• 36156aa Ensure truthy is used consistently in the context of hijacking support in R...
• 7d09de4 Tidy up checks for script_name, path_info. (#2357)
• 5ce04c1 lint.rb consistency improvements. (#2352)
• 5f06728 Regenerate SPEC.rdoc.
• 9453930 Make Rack::Lint disallow PATH_INFO="" SCRIPT_NAME="" (#2316)
• Additional commits viewable in compare view

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