serverAddress: InetSocketAddress,
  ): Future<Handshake> {
    return executorService.submit<Handshake> {
      SocketFactory.getDefault().createSocket().use { rawSocket ->
        rawSocket.connect(serverAddress)
        val sslSocket =
          client.sslSocketFactory().createSocket(
            rawSocket,
            rawSocket.inetAddress.hostAddress,
            rawSocket.port,
            true,
          ) as SSLSocket