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()