code: def url_value_preprocessor(self, func: Callable) -> Callable:
          
          self.record_once(lambda state: state.app.url_value_preprocessor(func, self.name))
          return func
docs: Add a url value preprocessor.
  
          This is designed to be used as a decorator, and has the same
          arguments as :meth:`~quart.Quart.url_value_preprocessor`. This
          will apply to urls in this blueprint. An example usage,
  
          .. code-block:: python
  
              blueprint = Blueprint(__name__)
              @blueprint.url_value_preprocessor
              def processor(endpoint, view_args):
                  ...