Support Ruby 2.7.3

Keep the latest Ruby 2.7 release line by using the leading-argument forwarding syntax available since Ruby 2.7.3. Test both the minimum version and the latest 2.7 patch release.

Assisted-By: devx/4adb4993-e502-416b-8fe7-efc94c16ae7e

Author: samuel-williams-shopify

.github/workflows/test.yaml

@@ -13,6 +13,8 @@ jobs:
         os:
           - ubuntu-latest
         ruby:
+          - '2.7'
+          - '2.7.3'
           - '3.0'
           - '3.1'
           - '3.2'

.rubocop.yml

@@ -2,7 +2,7 @@ require:
   - rubocop-packaging
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 2.7
   DisabledByDefault: true
   Exclude:
     - '**/vendor/**/*'

CHANGELOG.md

@@ -20,7 +20,7 @@ All notable changes to this project will be documented in this file. For info on
 
 ### Changed
 
-- Require Ruby 3.0 or newer and replace `ruby2_keywords` with argument forwarding.
+- Require Ruby 2.7.3 or newer and replace `ruby2_keywords` with argument forwarding.
 - Raise before exceeding a part limit, not after. ([#2362](https://github.com/rack/rack/pull/2362), [@matthew-puku](https://github.com/matthew-puku))
 - Rack::Deflater now uses a fixed GZip mtime value. ([#2372](https://github.com/rack/rack/pull/2372), [@bensheldon](https://github.com/bensheldon))
 - Multipart parser drops support for RFC 2231 `filename*` parameter (prohibited by RFC 7578) and now properly handles UTF-8 encoded filenames via percent-encoding and direct UTF-8 bytes. ([#2398](https://github.com/rack/rack/pull/2398), [@wtn](https://github.com/wtn))

lib/rack/headers.rb

@@ -217,8 +217,11 @@ def transform_keys!
       replace(hash)
     end
 
-    def except(*a)
-      super(*a.map!{|key| downcase_key(key)})
+    # Ruby < 3.0 does not provide Hash#except.
+    if Hash.method_defined?(:except)
+      def except(*a)
+        super(*a.map!{|key| downcase_key(key)})
+      end
     end
 
     private

lib/rack/mock_response.rb

@@ -23,8 +23,8 @@ def initialize(args)
         @secure = args["secure"]
       end
 
-      def method_missing(method_name, ...)
-        @value.send(method_name, ...)
+      def method_missing(...)
+        @value.send(...)
       end
 
       def respond_to_missing?(method_name, include_all = false)

lib/rack/multipart/uploaded_file.rb

@@ -74,8 +74,8 @@ def respond_to_missing?(*args)
       end
 
       # Delegate method missing calls to the tempfile.
-      def method_missing(method_name, ...) #:nodoc:
-        @tempfile.__send__(method_name, ...)
+      def method_missing(...) #:nodoc:
+        @tempfile.__send__(...)
       end
     end
   end

rack.gemspec

@@ -25,7 +25,7 @@ Gem::Specification.new do |s|
 
   s.homepage = 'https://github.com/rack/rack'
 
-  s.required_ruby_version = '>= 3.0.0'
+  s.required_ruby_version = '>= 2.7.3'
 
   s.metadata = {
     "bug_tracker_uri" => "https://github.com/rack/rack/issues",

test/spec_headers.rb

@@ -503,10 +503,12 @@ def test_deconstruct_keys
     assert_equal(Rack::Headers, @fh.deconstruct_keys([]).class)
   end
 
-  def test_except
-    @fh = Rack::Headers['AB'=>'1', 'Cd'=>'2', '3'=>'4']
-    assert_equal(@fh, @fh.except)
-    assert_equal(Rack::Headers['cD'=>'2', '3'=>'4'], @fh.except('AB', 5))
-    assert_equal(Rack::Headers['AB'=>'1'], @fh.except('cD', '3'))
+  if Hash.method_defined?(:except)
+    def test_except
+      @fh = Rack::Headers['AB'=>'1', 'Cd'=>'2', '3'=>'4']
+      assert_equal(@fh, @fh.except)
+      assert_equal(Rack::Headers['cD'=>'2', '3'=>'4'], @fh.except('AB', 5))
+      assert_equal(Rack::Headers['AB'=>'1'], @fh.except('cD', '3'))
+    end
   end
 end