404. That’s an error.
The requested URL /add?source=atgs&feedurl=http://nhadat.info/service-rss-s8-cho-thue-bat-dong-san-khac.rss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http://nhadat.info/service-rss-s8-cho-thue-bat-dong-san-khac.rss