docs: def auto_version_url(file_path):
      """ Appends modification time of the file to the request URL in order for the
          browser to refresh the cache when file changes
  
          @param file_path: path to the file, e.g js/foo.js
          @return: file_path with modification time appended to URL
      """
      file_md5 = ""
      try:
          file_md5 = md5(open(cfg.get('CFG_WEBDIR') +
                              os.sep + file_path).read()).hexdigest()
      except IOError:
          pass
      return file_path + "?%s" % file_md5