public function fileGet(Silex\Application $app)
 {
     $request = new \Flow\Request();
     $chunkNumber = $request->getCurrentChunkNumber() ?: 0;
     $chunkSize = $request->getDefaultChunkSize() ?: 0;
     $totalSize = $request->getTotalSize() ?: 0;
     $identifier = $request->getIdentifier() ?: '';
     $filename = $request->getFileName() ?: '';
     if ($this->validateRequest($chunkNumber, $chunkSize, $totalSize, $identifier, $filename) == 'valid') {
         $chunkFilename = $this->getChunkFilename($chunkNumber, $identifier);
         if (realpath($chunkFilename) !== false) {
             utils::log($request->param('REQUEST_METHOD') . 'found');
             return new Response('', Response::HTTP_OK, ['Content-Type' => 'text/plain']);
         }
     }
     return new Response('', Response::HTTP_NOT_FOUND, ['Content-Type' => 'text/plain']);
 }