socket.js connect server fail

[zkl0205]

1.html code
js: <script src="https://cdn.bootcdn.net/ajax/libs/socket.io/2.4.0/socket.io.js"></script>
function connect() {
var userId = 51;
var opts = {
transports: ['websocket'],
query: 'userId=' + userId
};
var serverWs = "ws://localhost:9098";

    socket = io.connect(serverWs, opts);
    socket.on('connect', function () {
        console.log("连接成功");
        serverOutput('<span class="connect-msg">连接成功</span>');
    });
}

2.java server
Exception caught at channel: [id: 0xccdccf27, L:/0:0:0:0:0:0:0:1:9098 ! R:/0:0:0:0:0:0:0:1:61444], not an SSL/TLS record:
How to resolve errors