I tried to write a client for a given server domain name as http://demo-chat-server.on.ag/. However, I can not connect my client to this server. My code is like this:

const io = require("socket.io-client");
const socket = io.connect("http://demo-chat-server.on.ag/", {secure: true,    rejectUnauthorized: false});

socket.emit("connect", () => {
    console.log(socket.connected);
});

socket.on("disconnect", () => {
    console.log(socket.connected); // false
});

I received this 404 error from the console:

Can someone help me?

Also here is the task description:

task description