I am building a simple login system using node.js and its socket.io module.
I am done with the authentication part, i.e., using MongoDB, I can now ascertain whether the user attempting to log in is genuine or fake.
At this stage, when I find a genuine login, I need to redirect the client to a different page (index.html). However, because a request is not sent and a response is not expected with a socket.io event, I cannot use
response.setHeader(...);
because there is no 'response' parameter in my callback function. Here is my code:

On client side:

<script src=/socket.io/socket.io.js></script>

<script src=http://code.jquery.com/jquery-1.11.1.js></script>

<script>

    var socket=io();

    $('form').submit(function(){

        var un=$('#un').val();

        var pw=$('#pw').val();

        socket.emit('login',un,pw);

        return false;

    });

</script>

and on the server end,

var app=require('express')();

var server=require('http').Server(app);

var io=socket(server);

io.on('connection',function(client){

client.on('login',function(username,pw){

    //if authenticated, direct the client to index.html

    });

});

Can anyone please suggest any method to do this?