code: def handle_api_explorer_request(self, request, start_response):
      
      redirect_url = self._get_explorer_redirect_url(
          request.server, request.port, request.base_path)
      return util.send_wsgi_redirect_response(redirect_url, start_response)
docs: Handler for requests to {base_path}/explorer.
  
      This calls start_response and returns the response body.
  
      Args:
        request: An ApiRequest, the request from the user.
        start_response: A function with semantics defined in PEP-333.
  
      Returns:
        A string containing the response body (which is empty, in this case).