# File lib/em-websocket/handshake76.rb, line 6
      def handshake(headers, path, secure)
        challenge_response = solve_challenge(
          headers['sec-websocket-key1'],
          headers['sec-websocket-key2'],
          headers['third-key']
        )

        scheme = (secure ? "wss" : "ws")
        location = "#{scheme}://#{headers['host']}#{path}"

        upgrade =  "HTTP/1.1 101 WebSocket Protocol Handshake\r\n"
        upgrade << "Upgrade: WebSocket\r\n"
        upgrade << "Connection: Upgrade\r\n"
        upgrade << "Sec-WebSocket-Location: #{location}\r\n"
        upgrade << "Sec-WebSocket-Origin: #{headers['origin']}\r\n"
        if protocol = headers['sec-websocket-protocol']
          validate_protocol!(protocol)
          upgrade << "Sec-WebSocket-Protocol: #{protocol}\r\n"
        end
        upgrade << "\r\n"
        upgrade << challenge_response

        return upgrade
      end