promise httpRequest using Q on Titanium

example.js

qHttp({
    url: 'YOUR_URL',
    method: "POST",
    data: {
        "access_token" : 'YOUR_TOKEN'
    }
}).then(function (args){
	// step 2 : other request
	return qHttp({
		
	})
}).then(function (args){
	// args from step2 http request
}).catch(function () {
 
});

qHttp.js

var Q = require('q');
var httpRequest = (function() {
  function encodeData(obj, url) {
    var str = [], value;
  	for (var p in obj) {
  		value = _.isObject(obj[p])?JSON.stringify(obj[p]):obj[p];
  		str.push(Ti.Network.encodeURIComponent(p) + "=" + Ti.Network.encodeURIComponent(value));
  	}

  	if (_.indexOf(url, "?") == -1) {
  		return url + "?" + str.join("&");
  	} else {
  		return url + "&" + str.join("&");
  	}
  }

  return function(args) {
    var defer,
      tiHttpClient;
    var url = args.url;
    var data = args.data;
    var method = args.method || 'GET';
    var headers = args.headers;

    defer = Q.defer();

    tiHttpClient = Ti.Network.createHTTPClient({
      onload: function() {
        var parsedData;
        var error;
        try {
          parsedData = JSON.parse(this.responseText || "{}");
        } catch (e) {
          error = e;
        }

        if (error) {
          defer.reject({
            status: this.status,
            data: parsedData,
            source: this
          });
        } else {
          defer.resolve({
            status: this.status,
            data: parsedData,
            source : this,
            date : this.getResponseHeader('Date')
          });
        }
      },
      onerror: function(e) {
        var parsedData;
        try {
          parsedData = JSON.parse(this.responseText ||  "{}");
        } catch (e) {
          // error = e;
        }
        
        defer.reject({
          status : this.status,
          data : parsedData,
          source : this
        });
      },
      onsendstream: function(e) {
        defer.notify(e);
      },
      timeout: 10000
    });

    if (method == 'GET' && data) {
      url = encodeData(data, url);
    }

    tiHttpClient.open(method, url, true);



    var sendData;
    if (method == 'POST' || method == 'PUT') {
      tiHttpClient.setRequestHeader('Content-Type', "application/json; charset=utf-8");
      sendData = (typeof data === 'object') ? JSON.stringify(data) : data;
    }

    _.each(headers, function(value, key) {
      tiHttpClient.setRequestHeader(key, value);
    });

    tiHttpClient.send(sendData);

    return defer.promise;
  };
})();

exports.httpRequest = httpRequest;