Initialize configuration.

        .. note:: Change Flask-CORS and Flask-Limiter defaults.

        :param app: An instance of :class:`flask.Flask`.

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))