Socket.io client bad request code null

I am attempting to run my node process with socket.io however whenever my client connects it gets bad request code: null

my server looks like this:

io.set('origins', '*');
var connectionCount = 0;
io.on('connection', function (socket) {
    connectionCount++;
    socket.on('userData', function (userDetails) {
        userDetails.socket = socket;
        ConnectionManager.addOrUpdateUser(userDetails);
        ConnectionController.addUser(userDetails);
        console.log('user added');
    });

    var chatModule = require('./socket_modules/Chat/Chat.js')(socket, ConnectionController);
    var notificationModule = require('./socket_modules/Notification/Notification.js')(socket, ConnectionController);
    var statModule = require('./socket_modules/Stat/Stat.js')(socket, ConnectionController);
    socket.on('userDisconnect', function (user_id) {
        ConnectionController.removeUser(user_id);
    });

    socket.on('newServer', function (server) {
        ConnectionManager.addServer(server);
        console.log('newServer addded ' + server);
    });

    socket.on('serverClosed', function (server) {
        console.log('server closed' + server);
    })
});

http.listen(listenTo, function () {
    console.log('listening on *:' + listenTo);
});

The error response is:

http://test-socket.lbservice.net/socket.io/?EIO=3&transport=polling&t=LhIG0yG

Response of the request is:

{"code":null}

Headers:

Access-Control-Allow-Credentials:true
Access-Control-Allow-Origin:http://test-www.lbservice.net
Connection:keep-alive
Content-Length:13
Content-Type:application/json
Date:Wed, 15 Mar 2017 13:55:47 GMT
Server:nginx/1.10.0

Has anyone ever encountered this and know how i might fix it?

via Marc Rasmussen