Echoserver and JavaScript about bluesocket HOT 3 CLOSED

Server received from connection at ::1:51265: GET /socket.io/?EIO=4&transport=polling&t=O1X3EZt HTTP/1.1
Host: localhost:1338
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Origin: http://127.0.0.1:5500
DNT: 1
Connection: keep-alive
Referer: http://127.0.0.1:5500/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: cross-site

<script src="https://cdn.socket.io/3.1.3/socket.io.min.js" integrity="sha384-cPwlPLvBTa3sKAgddT6krw0cJat7egBga3DJepJyrLl4Q9/5WLra3rrnMcyTyOnh" crossorigin="anonymous"></script>

<script>
    const socket = io("localhost:1337", {
        reconnectionDelay: 5000,
        reconnection:false,
        transports: ["websocket"],
        reconnectionAttempts: 10,
        agent: false,
        upgrade: false,
        rejectUnauthorized: false
    });
    socket.on("connect", (data) => {
        console.log("sdfsdfsdfs");
    });
    socket.on("connect_error", (err) => {
        console.log(err);
    });
</script>