关于workerman作为客户端WSS连接问题

if ($this->transport !== 'unix') {
    // Open socket connection asynchronously. 
    if ($this->_contextOption) {
        $context = stream_context_create($this->_contextOption);
        $this->_socket = stream_socket_client("tcp://{$this->_remoteHost}:{$this->_remotePort}",
            $errno, $errstr, 0, STREAM_CLIENT_ASYNC_CONNECT, $context);
    } else {
        $this->_socket = stream_socket_client("tcp://{$this->_remoteHost}:{$this->_remotePort}",
            $errno, $errstr, 0, STREAM_CLIENT_ASYNC_CONNECT);
    }
} else {
    var_dump(211221122121);
    $this->_socket = stream_socket_client("{$this->transport}://{$this->_remoteAddress}", $errno, $errstr, 0,
        STREAM_CLIENT_ASYNC_CONNECT);
}

我想问一下官方，WSS是用TCP连接吗？
调试输出执行了这一句

$this->_socket = stream_socket_client("tcp://{$this->_remoteHost}:{$this->_remotePort}",
$errno, $errstr, 0, STREAM_CLIENT_ASYNC_CONNECT);
$this->transport =="ssl"