/** The low-level TCP socket. */
  private var rawSocket: JavaNetSocket? = null

  /**
   * The application layer socket. Either an [SSLSocket] layered over [rawSocket], or [rawSocket]
   * itself if this connection does not use SSL.
   */
  internal var javaNetSocket: JavaNetSocket? = null
  private var handshake: Handshake? = null
  private var protocol: Protocol? = null

          Http2Connection
            .Builder(false, taskRunner)
            .socket(socket, socket.javaNetSocket.remoteSocketAddress.toString())
            .listener(http2SocketHandler)
            .build()
        connection.start()
        openConnections.add(connection)
        openClientSockets.remove(socket.javaNetSocket)
        return
      } else if (protocol !== Protocol.HTTP_1_1) {
        throw AssertionError()