code: def shared_limit(self, limit_value, scope, key_func=None,
                       error_message=None, exempt_when=None):
          
          return self.__limit_decorator(
              limit_value, key_func, True, scope, error_message=error_message,
              exempt_when=exempt_when
          )
docs: decorator to be applied to multiple routes sharing the same rate limit.
  
          :param limit_value: rate limit string or a callable that returns a string.
           :ref:`ratelimit-string` for more details.
          :param scope: a string or callable that returns a string
           for defining the rate limiting scope.
          :param function key_func: function/lambda to extract the unique identifier for
           the rate limit. defaults to remote address of the request.
          :param error_message: string (or callable that returns one) to override the
           error message used in the response.