code: def jwt_optional(fn):
      
      @wraps(fn)
      def wrapper(*args, **kwargs):
          verify_jwt_in_request_optional()
          return fn(*args, **kwargs)
      return wrapper
docs: A decorator to optionally protect a Flask endpoint
  
      If an access token in present in the request, this will call the endpoint
      with :func:`~flask_jwt_extended.get_jwt_identity` having the identity
      of the access token. If no access token is present in the request,
      this endpoint will still be called, but
      :func:`~flask_jwt_extended.get_jwt_identity` will return `None` instead.
  
      If there is an invalid access token in the request (expired, tampered with,
      etc), this will still call the appropriate error handler instead of allowing
      the endpoint to be called as if there is no access token in the request.