# File lib/faye/websocket/draft76_parser.rb, line 9
      def handshake_response
        env = @socket.env
        signature = handshake_signature(env['rack.input'].read)

        upgrade =  "HTTP/1.1 101 Web Socket Protocol Handshake\r\n"
        upgrade << "Upgrade: WebSocket\r\n"
        upgrade << "Connection: Upgrade\r\n"
        upgrade << "Sec-WebSocket-Origin: #{env['HTTP_ORIGIN']}\r\n"
        upgrade << "Sec-WebSocket-Location: #{@socket.url}\r\n"
        upgrade << "\r\n"
        upgrade << signature if signature
        upgrade
      end