docs: def _make_url(self, url_part, blueprint_prefix):
          """Create URL from blueprint_prefix, api prefix and resource url.
  
          This method is used to defer the construction of the final url in
          the case that the Api is created with a Blueprint.
  
          :param url_part: The part of the url the endpoint is registered with
          :param blueprint_prefix: The part of the url contributed by the
              blueprint.  Generally speaking, BlueprintSetupState.url_prefix
          """
          parts = (blueprint_prefix, self.prefix, url_part)
          return ''.join(_ for _ in parts if _)