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.

[3.0.0] - Unreleased

Security

• Do not use semicolon as GET parameter separator. (#1733, [@​jeremyevans])

SPEC Changes

• Response status must now be an integer greater than or equal to 100.
• Response headers must now be an unfrozen hash.
• Response header keys can no longer include uppercase characters.
• Response header values can be an Array to handle multiple values (and no longer supports \n encoded headers).
• Response body can now respond to #call (streaming body) instead of #each (enumerable body), for the equivalent of response hijacking in previous versions.
• Middleware must no longer call #each on the body, but they can call #to_ary on the body if it responds to #to_ary.
• rack.input is no longer required to be rewindable.
• rack.multithread/rack.multiprocess/rack.run_once are no longer required environment keys.
• SERVER_PROTOCOL is now a required key, matching the HTTP protocol used in the request.

Removed

• Remove rack.multithread/rack.multiprocess/rack.run_once. These variables generally come too late to be useful. (#1720, [@​ioquatix], [@​jeremyevans]))
• Remove deprecated Rack::Request::SCHEME_WHITELIST. ([@​jeremyevans])
• Remove internal cookie deletion using pattern matching, there are very few practical cases where it would be useful and browsers handle it correctly without us doing anything special. (#1844, [@​ioquatix])

Added

• Rack::Headers added to support lower-case header keys. ([@​jeremyevans])
• Rack::Utils#set_cookie_header now supports escape_key: false to avoid key escaping. ([@​jeremyevans])
• Rack::RewindableInput supports size. (@​ahorek)
• Rack::RewindableInput::Middleware added for making rack.input rewindable. ([@​jeremyevans])
• The RFC 7239 Forwarded header is now supported and considered by default when looking for information on forwarding, falling back to the X-Forwarded-* headers. Rack::Request.forwarded_priority accessor has been added for configuring the priority of which header to check. (#1423, [@​jeremyevans])
• Allow response headers to contain array of values. (#1598, [@​ioquatix])

Changed

• BREAKING CHANGE: Require status to be an Integer. (#1662, @​olleolleolle)
• BREAKING CHANGE: Query parsing now treats parameters without = as having the empty string value instead of nil value, to conform to the URL spec. (#1696, [@​jeremyevans])
• Relax validations around Rack::Request#host and Rack::Request#hostname. (#1606, @​pvande)
• Removed antiquated handlers: FCGI, LSWS, SCGI, Thin. (#1658, [@​ioquatix])
• Removed options from Rack::Builder.parse_file and Rack::Builder.load_file. (#1663, [@​ioquatix])
• Rack::HTTP_VERSION has been removed and the HTTP_VERSION env setting is no longer set in the CGI and Webrick handlers. (#970, [@​jeremyevans])
• Rack::Request#[] and #[]= now warn even in non-verbose mode. (#1277, [@​jeremyevans])
• Decrease default allowed parameter recursion level from 100 to 32. (#1640, [@​jeremyevans])
• Attempting to parse a multipart response with an empty body now raises Rack::Multipart::EmptyContentError. (#1603, [@​jeremyevans])
• Rack::Utils.secure_compare uses OpenSSL's faster implementation if available. (#1711, @​bdewater)
• Rack::Request#POST now caches an empty hash if input content type is not parseable. (#749, [@​jeremyevans])

... (truncated)

• 47a1fd7 bump version
• b8dc520 Handle case where session id key is requested but it is missing
• 698a060 Merge pull request #1462 from jeremyevans/sessionid-to_s
• de902e4 Merge branch '1-6-sec' into 1-6-stable
• b7d6546 Bump version
• d3e2f88 making diff smaller
• 99a8a87 fix memcache tests on 1.6
• f2cb48e fix tests on 1.6
• 7ff635c Introduce a new base class to avoid breaking when upgrading
• 3232f93 Add a version prefix to the private id to make easier to migrate old values
• Additional commits viewable in compare view

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.