if (isset($_SERVER['HTTP_ACCEPT'])) {
      // normalize things like "application/json; charset=utf-8" to application/json
      foreach ($acceptedContentTypes as $contentType) {
        if (strpos(strtolower($_SERVER['HTTP_ACCEPT']), $contentType) !== false) {
          $_SERVER['HTTP_ACCEPT'] = $contentType;
          $this->setContentType($contentType);
          break;
        }
      }
    }