code: function (xhr) {
              var me = this,
                  ret = {},
                  method = 'do' + Ext.String.capitalize(xhr.method.toLowerCase()), // doGet
                  fn = me[method];
  
              if (fn) {
                  ret = fn.call(me, me.getCtx(xhr.method, xhr.url, xhr));
              } else {
                  ret = { status: 405, statusText: 'Method Not Allowed' };
              }
  
              return ret;
          }
docs: Performs the action requested by the given XHR and returns an object to be applied
  on to the XHR (containing `status`, `responseText`, etc.). For the most part,
  this is delegated to `doMethod` methods on this class, such as `doGet`.
  
  @param {Ext.ux.ajax.SimXhr} xhr The simulated XMLHttpRequest instance.
  @returns {Object} The response properties to add to the XMLHttpRequest.