code: def __call__(self, environ, start_response):
      path = environ.get("PATH_INFO", "")
      if path:
          return self._application(environ, start_response)
      location = environ.get("SCRIPT_NAME", "") + "/"
      start_response("301 Moved Permanently", [("Location", location)])
      return []
  
label_desc: Use image node_id 2 for calling the EmptyPathRedirectMiddleware obj's underlying member method code with example usage: obj.__call__(environ, start_response) and returns: list, self