AsyncTcpConnection连接wss出现unknown protocol错误

SSL handshake error: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:
error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol

$con = new AsyncTcpConnection('ws://api.zb.live/websocket', [
    'ssl' => [
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    ]
]);
$con->transport = 'ssl';
$con->connect();