use "mime_type" instead of "format"

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3874 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_controller/cgi_ext/cgi_methods.rb

@@ -74,7 +74,7 @@ def self.parse_formatted_request_parameters(mime_type, raw_post_data)
       params || {}
     rescue Object => e
       { "exception" => "#{e.message} (#{e.class})", "backtrace" => e.backtrace, 
-        "raw_post_data" => raw_post_data, "format" => format }
+        "raw_post_data" => raw_post_data, "format" => mime_type }
     end
 
   private