클라이언트 WebSocket 오류! 실패: 잘못된 프레임 헤더

서버 코드(swoole 사용)

<code>$serv = new swoole_websocket_server("**********", 9502);

$serv->on('Open', function($server, $req) {
    echo "connection open: ".$req->fd;
});

$serv->on('Message', function($server, $frame) {
    echo "message: ".$frame->data;
    $server->push($frame->fd, json_encode(["hello", "world"]));
});

$serv->on('Close', function($server, $fd) {
    echo "connection close: ".$fd;
});

$serv->start();
</code>