/**
  * @param UriInterface $uri
  *
  * @return ResponseInterface|null
  */
 private function getStaticFile(UriInterface $uri)
 {
     $path = $this->extractPath($uri);
     if (strpos($path, $this->debugBarRenderer->getBaseUrl()) !== 0) {
         return;
     }
     $pathToFile = substr($path, strlen($this->debugBarRenderer->getBaseUrl()));
     $fullPathToFile = $this->debugBarRenderer->getBasePath() . $pathToFile;
     if (!file_exists($fullPathToFile)) {
         return;
     }
     $contentType = $this->getContentTypeByFileName($fullPathToFile);
     $stream = new Stream($fullPathToFile, 'r');
     return new Response($stream, 200, ['Content-type' => $contentType]);
 }