def url_defaults(self, func: Callable) -> Callable:
        """Add a url default preprocessor.

        This is designed to be used as a decorator, and has the same
        arguments as :meth:`~quart.Quart.url_defaults`. This will
        apply to urls in this blueprint. An example usage,

        .. code-block:: python

            blueprint = Blueprint(__name__)
            @blueprint.url_defaults
            def default(endpoint, values):
                ...

        """
        self.record_once(lambda state: state.app.url_defaults(func, self.name))
        return func