Hello @kartik,
The use of http.createClient is now deprecated. You can pass Headers in options collection as below.
var options = { 
    hostname: 'example.com',
    path: '/somePath.php',
    method: 'GET',
    headers: {'Cookie': 'myCookie=myvalue'}
};
var results = ''; 
var req = http.request(options, function(res) {
    res.on('data', function (chunk) {
        results = results + chunk;
        //TODO
    }); 
    res.on('end', function () {
        //TODO
    }); 
});
req.on('error', function(e) {
        //TODO
});
req.end();
Hope it helps!!
Thank you!!