Sourced from rack's changelog.

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 Rack::Files#assign_headers to allow overriding how the configured file headers are set. (#2377, @​codergeek121)
• 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)
• Rack::Deflater now uses a fixed GZip mtime value. (#2372, @​bensheldon)

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])

... (truncated)

• 0f76d43 Bump patch version.
• 493a411 Fix thin integration.
• 54e4ffd Unbounded parameter parsing in Rack::QueryParser.
• See full diff in compare view

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