# File lib/sinatra/respond_to.rb, line 192
      def self.included(klass)
        klass.class_eval do
          alias :content_type_without_save :content_type
          def content_type(*args)
            content_type_without_save *args
            @_format = args.first.to_sym
            response['Content-Type']
          end
        end
      end