    # File lib/mongrel/cgi.rb, line 127
        def out(options = "text/html", really_final=@default_really_final)
          if @out_called || !really_final
            # don't do it more than once or if it's not the really final call
            return
          end

          header(options)

          @response.start status do |head, body|
            send_cookies(head)

            @head.each {|k,v| head[k] = v}
            body.write(yield || "")
          end

          @out_called = true
        end