public function stripXmlNamespaces(CompleteEvent $event)
 {
     /**
      * Parsing XML with namespaces doesn't seem to work for Guzzle,
      * so using regex to remove them.
      */
     $xml = $event->getResponse()->getBody()->getContents();
     $xml = Utils::stripNamespacesFromXml($xml);
     /**
      * Intercept response and replace body with cleaned up XML
      */
     $stream = Stream::factory($xml);
     $response = $event->getResponse();
     $response->setBody($stream);
     $event->intercept($response);
 }