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websocket连接不上服务器，提示Provisional headers are shown

老师我的服务器代码是部署在阿里云服务器上，LNMP环境。

服务端ws_server.php代码：

$server = new swoole_websocket_server("0.0.0.0", 8812);
//$server->set([]);
$server->set(
    [
        'enable_static_handler' => true,
        'document_root' => "/home/wwwroot/www.lingyuan88.com/public/swoole/data",
    ]
);
//监听websocket连接打开事件
$server->on('open', 'onOpen');
function onOpen($server, $request) {
    print_r($request->fd);
}

// 监听ws消息事件
$server->on('message', function (swoole_websocket_server $server, $frame) {
    echo "receive from {$frame->fd}:{$frame->data},opcode:{$frame->opcode},fin:{$frame->finish}\n";
    $server->push($frame->fd, "singwa-push-secesss");
});

$server->on('close', function ($ser, $fd) {
    echo "client {$fd} closed\n";
});

$server->start();

客户端ws_client.html代码：

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
<h1>singwa-swoole-ws测试</h1>
  <script>
    var wsUrl = "ws://120.77.206.215:8812";

    var websocket = new WebSocket(wsUrl);

    //实例对象的onopen属性
    websocket.onopen = function(evt) {
      websocket.send("hello-sinwa");
      console.log("conected-swoole-success");
    }

    // 实例化 onmessage
    websocket.onmessage = function(evt) {
      console.log("ws-server-return-data:" + evt.data);
    }

    //onclose
    websocket.onclose = function(evt) {
      console.log("close");
    }
    //onerror

    websocket.onerror = function(evt, e) {
      console.log("error:" + evt.data);
    }

 </script>
</body>
</html>