404. That’s an error.
The requested URL /add?source=atgs&feedurl=http://game.24h.com.vn/upload/rss/game-hanh-dong.rss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http://game.24h.com.vn/upload/rss/game-hanh-dong.rss