Allow caching of WP feed by WP Rocket

rocket-cache-feed.php

function wp_rocket_cache_feed( $uri ) {
	$feed = '/(.+/)?' . $GLOBALS['wp_rewrite']->feed_base . '/?';
	if ( in_array( $feed, $uri ) ) {
		$uri = array_flip( $uri );
		unset( $uri[ $feed ] );
		$uri = array_flip( $uri );
	}

	return $uri;
}
add_filter( 'rocket_cache_reject_uri', 'wp_rocket_cache_feed' );