code: def _display_token(self):
          
          if self.token is None:
              return "301 Moved", "", {"Location": "/login"}
  
          return ("200 OK",
                  self.TOKEN_TEMPLATE.format(
                      access_token=self.token["access_token"]),
                  {"Content-Type": "text/html"})
docs: Display token information or redirect to login prompt if none is
          available.