docs: def handle_http_exception(error):
      """
      Attempts to render a template based on the `code` of a `HTTPException`. The
      format string `errors/{code}.html` is used to generate the filename of
      the template.
  
      e.g. A `NotFound` exception will attempt to render `errors/404.html`.
  
      If no template is found the standard flask error response is returned.
      """
      template = TEMPLATE.format(code=error.code)
  
      try:
          return flask.render_template(template, exception=error), error.code
      except jinja2.exceptions.TemplateNotFound:
          pass
  
      return error