Update rack requirement from ~> 2.0, >= 2.0.6 to >= 2.0.6, < 4

Updates the requirements on rack to permit the latest version.

Changelog

[3.0.0] - 2022-09-06

No changes

[3.0.0.rc1] - 2022-09-04

SPEC Changes

Stream argument must implement << rack/rack#1959

close may be called on rack.input rack/rack#1956

rack.response_finished may be used for executing code after the response has been finished rack/rack#1952

[3.0.0.beta1] - 2022-08-08

Security

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

SPEC Changes

Response array must now be non-frozen.

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/rack.version are no longer required environment keys.

SERVER_PROTOCOL is now a required environment key, matching the HTTP protocol used in the request.

rack.hijack? (partial hijack) and rack.hijack (full hijack) are now independently optional.

rack.hijack_io has been removed completely.

rack.response_finished is an optional environment key which contains an array of callable objects that must accept #call(env, status, headers, error) and are invoked after the response is finished (either successfully or unsucessfully).

It is okay to call #close on rack.input to indicate that you no longer need or care about the input.

The stream argument supplied to the streaming body and hijack must support #<< for writing output.

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])

Remove rack.version as it comes too late to be useful. (#1938, [@ioquatix])

Extract rackup command, Rack::Server, Rack::Handler and related code into a separate gem. (#1937, [@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])

... (truncated)

Commits

52901ca bump version, update changelog
e58e2eb Fix unclosed strings in UPGRADE-GUIDE.md (#1960)
12742a0 bump version, update changelog
6aad539 The stream argument must implement #<<. (#1959)
ffee3c5 Allow calling close on rack.input. (#1956)
6fc4a32 Make MockResponse#body work if body.each reuses strings for performance
1a9b98d For some reason, the recently released version breaks Ruby v2.5.
856c4f9 Add rack.response_finished to Rack::Lint. (#1952)
1a37044 Refactor tests. (#1953)
293b8e7 Do not add lib to load path when running separate tests
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