Node.js request with Q promises

promisedRequest.js

//import the http library
var http = require('http'),
//npm install q before requiring it
	Q = require('q');

//a js object with options
var googleNewsOptions = {
  hostname: 'ajax.googleapis.com',
  path: '/ajax/services/search/news?v=1.0&q=nodejs',
  method: 'GET'
};

/**
 * wrapper for http request object
 * @param  {Object} requestOptions
 * @return Promise Object
 */
 function promisedRequest(requestOptions) {
 	//create a deferred object from Q
	var deferred  = Q.defer();
	var req = http.request(requestOptions, function(response) {
	  //set the response encoding to parse json string
	  response.setEncoding('utf8');
	  var responseData = '';
	  //append data to responseData variable on the 'data' event emission
	  response.on('data', function(data) {
	  	responseData += data;
	  });
	  //listen to the 'end' event
	  response.on('end', function() {
	  	//resolve the deferred object with the response
	  	deferred.resolve(responseData);
	  });
	});
	
	//listen to the 'error' event
	req.on('error', function(err) {
	  //if an error occurs reject the deferred
	  deferred.reject(err);
	});
	req.end();
	//we are returning a promise object
	//if we returned the deferred object
	//deferred object reject and resolve could potentially be modified
	//violating the expected behavior of this function
	return deferred.promise;
};
//incoking the above function with the request options
promisedRequest(googleNewsOptions)
.then(function(newsResponse) { //callback invoked on deferred.resolve
	console.log(JSON.stringify(newsResponse));
}, function(newsError) { //callback invoked on deferred.reject
	console.log(newsError);
});