404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A//rss.rssad.jp/rss/sonetrss/10000007415361_802595_index.rdf was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A//rss.rssad.jp/rss/sonetrss/10000007415361_802595_index.rdf