Deferred JSON with jquery / backbone.js

app.js

var App = {
  Views: {
    Member: {},
    Admin: {},
    Misc: {},
    Cart: {},
    Checkout: {}
  },
  Collections: {},
  Controllers: {},
  Data: {},


  notifyUser: function (type, data) {
    var templateName = "notification/" + type;
    loadTemplates([templateName])
      .then(function () {
        alert("notification for " + type + ": " + ich["notification_" + type](_.defaults(data, tplBaseData), true));
      });
  },

  notifyErrors: function (errors) {
    App.notifyUser("error", { "error": errors.join("\n") });
  },

  redirect: function (url, params) {
    redirectTo(getSiteUrl(url), params);
  },

  /**
   * Do a GET request to the app RestServer.
   **/
  GET: function (url, params) {
    var dfd = $.Deferred();
    $.getJSON(getSiteUrl(url, params))
      .then(function (res) { parseJSONResults(res, dfd); })
      .fail(function () { dfd.reject(["Network error"]); });
    return $.when(dfd.promise());
  },

  /**
   * Do a POST request to the app RestServer.
   **/
  POST: function (url, data) {
    var dfd = $.Deferred();
    $.postJSON(getSiteUrl(url), data)
      .then(function (res) { parseJSONResults(res, dfd); })
      .fail(function () { dfd.reject(["Network error"]); });
    return $.when(dfd.promise());
  },

  /**
   * Do a PUT request to the app RestServer.
   **/
  PUT: function (url, data) {
    var dfd = $.Deferred();
    $.putJSON(getSiteUrl(url), data)
      .then(function (res) { parseJSONResults(res, dfd); })
      .fail(function () { dfd.reject(["Network error"]); });
    return $.when(dfd.promise());
  },

  /**
   * Do a DELETE request to the app RestServer.
   **/
  DELETE: function (url) {
    var dfd = $.Deferred();
    $.deleteJSON(getSiteUrl(url))
      .then(function (res) { parseJSONResults(res, dfd); })
      .fail(function () { dfd.reject(["Network error"]); });
    return $.when(dfd.promise());
  }  
};