public function call()
 {
     $app = $this->app;
     $this->next->call();
     $res = $app->response;
     $time_end = microtime(true);
     $time = $time_end - $GLOBALS['EMA']['start_time'];
     $res->headers->set('X-EMA-Memory', UploadedFileManager::formatSizeUnits(memory_get_peak_usage(true)));
     $res->headers->set('X-EMA-Time', $time);
 }