fewer objects, no loop in convert_content_type. Closes #2883.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3058 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/CHANGELOG

 *SVN*
 
-* Performance tweaks: use Set instead of Array to speed up prototype helper include? calls.  Avoid logging code if logger is nil.  Inline commonly-called template presence checks.  #2880, #2881, #2882 [Stefan Kaes]
+* Performance tweaks: use Set instead of Array to speed up prototype helper include? calls.  Avoid logging code if logger is nil.  Inline commonly-called template presence checks.  #2880, #2881, #2882, #2883 [Stefan Kaes]
 
 * MemCache store may be given multiple addresses.  #2869 [Ryan Carver <ryan@fivesevensix.com>]
 

actionpack/lib/action_controller/cgi_process.rb

@@ -183,11 +183,14 @@ def out(output = $stdout)
 
     private
       def convert_content_type!(headers)
-        %w( Content-Type Content-type content-type ).each do |ct|
-          if headers[ct]
-            headers["type"] = headers[ct]
-            headers.delete(ct)
-          end
+        if header = headers.delete("Content-Type")
+          headers["type"] = header
+        end
+        if header = headers.delete("Content-type")
+          headers["type"] = header
+        end
+        if header = headers.delete("content-type")
+          headers["type"] = header
         end
       end
   end