protected function _processProxyServerResponseHeaders(EngineBlock_Http_Response $response)
 {
     $proxyHeaders = $this->_proxyServer->getHeaders();
     foreach ($proxyHeaders as $headerName => $headerValue) {
         if ($headerName === EngineBlock_Http_Response::HTTP_HEADER_RESPONSE_LOCATION) {
             $response->setRedirectUrl($headerValue);
         } else {
             $response->setHeader($headerName, $headerValue);
         }
     }
 }