docs: def init_config(self, app):
          """Initialize configuration.
  
          .. note:: Change Flask-CORS and Flask-Limiter defaults.
  
          :param app: An instance of :class:`flask.Flask`.
          """
          config_apps = ['REST_', 'CORS_', ]
          for k in dir(config):
              if any([k.startswith(prefix) for prefix in config_apps]):
                  app.config.setdefault(k, getattr(config, k))