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,

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      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

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      agreed to in writing, Licensor provides the Work (and each
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      names, trademarks, service marks, or product names of the Licensor,
      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

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