/**
  * Allows response to be type cast into a string when handling
  *
  * @return string
  */
 public function __toString()
 {
     $resultJSON = $this->encodeResponse();
     $callback = $this->request->getCallback();
     if (!empty($callback)) {
         return "{$callback}({$resultJSON})";
     } else {
         return $resultJSON;
     }
 }