Socket.io gives CORS error even if I allowed cors it on server

Question

My node server and client are running on different ports(3001,5347 respectively). On client I had used,

var socket = io(\'http://127.0.0.1:3001\');
         


        

Answer 1

If running Express as follows:

var app = express();
var server = app.listen(3000);

So to start socket.io, we can do the following:

var io = require('socket.io').listen(server);

The problem was because of following code:

var http = require('http').Server(app);
var io = require('socket.io')(http);

The server object passed to socket.io was not the same as the server object I'm listening on.