protected function getReturnUrl()
	{
	    if($this->getServiceLocator()->has(ReturnUrlService::SERVICE_ID)){
            $deliveryExecution = $this->getCurrentDeliveryExecution();
            return $this->getServiceLocator()->get(ReturnUrlService::SERVICE_ID)->getReturnUrl($deliveryExecution->getIdentifier());
        }
	    return _url('index', 'DeliveryServer', 'taoDelivery');
	}