Merge pull request #1942 from ericproulx/retained_http_method

Retained Grape::Http::Headers in memory instead of new ones created.

Author: dblock

CHANGELOG.md

@@ -3,6 +3,7 @@
 #### Features
 
 * Your contribution here.
+* [#1942](https://github.com/ruby-grape/grape/pull/1942): Optimized retained memory methods - [@ericproulx](https://github.com/ericproulx).
 * [#1941](https://github.com/ruby-grape/grape/pull/1941): Frozen string literal - [@ericproulx](https://github.com/ericproulx).
 * [#1940](https://github.com/ruby-grape/grape/pull/1940): Get rid of a needless step in HashWithIndifferentAccess - [@dnesteryuk](https://github.com/dnesteryuk).
 * [#1938](https://github.com/ruby-grape/grape/pull/1938): Add project metadata to the gemspec - [@orien](https://github.com/orien).

lib/grape/http/headers.rb

@@ -26,6 +26,10 @@ module Headers
       HTTP_ACCEPT            = 'HTTP_ACCEPT'
 
       FORMAT                 = 'format'
+
+      def self.find_supported_method(route_method)
+        Grape::Http::Headers::SUPPORTED_METHODS.detect { |supported_method| supported_method.casecmp(route_method).zero? }
+      end
     end
   end
 end

lib/grape/router.rb

@@ -46,7 +46,7 @@ def compile!
     end
 
     def append(route)
-      map[route.request_method.to_s.upcase] << route
+      map[route.request_method] << route
     end
 
     def associate_routes(pattern, **options)

lib/grape/router/route.rb

@@ -64,12 +64,13 @@ def route_path
       end
 
       def initialize(method, pattern, **options)
-        upcased_method = method.to_s.upcase
+        method_s = method.to_s
+        method_upcase = Grape::Http::Headers.find_supported_method(method_s) || method_s.upcase
 
         @suffix     = options[:suffix]
-        @options    = options.merge(method: upcased_method)
+        @options    = options.merge(method: method_upcase)
         @pattern    = Pattern.new(pattern, **options)
-        @translator = AttributeTranslator.new(**options, request_method: upcased_method)
+        @translator = AttributeTranslator.new(**options, request_method: method_upcase)
       end
 
       def exec(env)