@Override
  protected void saveAdditionalData(@NotNull HttpRequests.Request request, @NotNull File file) throws IOException {
    URLConnection connection = request.getConnection();
    if (saveTag(file, connection, ETAG_HEADER)) return;
    saveTag(file, connection, LAST_MODIFIED_HEADER);
  }
@Override
  protected void saveAdditionalData(@NotNull HttpRequests.Request request, @NotNull File file)