node.js – socket.io not connecting reactjs nodejs

server:

    const io = socketio(server, {
        cors: {
            origin: "https://melodybot.me",
            methods: ["GET", "POST"],
            credentials: true
        },
        transports: ['websocket', 'polling'],
        allowEIO3: true
    });```

client:

let connectionOptions = {
“force new connection”: true,
“reconnectionAttempts”: “Infinity”,
“timeout”: 10000,
“transports”: [“websocket”,”polling”],
};
const ws = new io(url, connectionOptions);

in browser its saying connection failed

i want connect socket.io with reactjs and nodejs backeend i am usingg apche ubuntu