404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A%2F%2Funty-harkov.uaprom.net%2Frss was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A%2F%2Funty-harkov.uaprom.net%2Frss