* @param {Object} arg An optional argument which is passed to the callback as its second parameter.\r
*/\r
doRequest : function(action, rs, params, reader, callback, scope, arg) {\r
* @param {Object} arg An optional argument which is passed to the callback as its second parameter.\r
*/\r
doRequest : function(action, rs, params, reader, callback, scope, arg) {\r