# File lib/sinatra/respond_with.rb, line 96
      def on(type, &block)
        @app.settings.mime_types(type).each do |mime|
          case mime
          when '*/*'            then @default     = block
          when /^([^\/]+)\/\*$/ then @generic[$1] = block
          else                       @map[mime]   = block
          end
        end
      end