/**
  *
  * @param <uri> $requestUrl
  * @return <array>
  */
 public function GetSingedHeaders($requestUrl)
 {
     try {
         return $this->_acsUtil->GetSingedHeaders();
     } catch (ACSUtilException $exception) {
         //re-throw the exception, client should handle this.
         throw $exception;
     }
 }