You can do it on a page-by-page basis. If your server supports PHP, add <? header('HTTP/1.1 503 Service Unavailable'); ?> before all other bytes in the file tha

You can do it on a page-by-page basis. If your server supports PHP, add <? header('HTTP/1.1 503 Service Unavailable'); ?> before all other bytes in the file that you want to 503.