404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A//rss.exblog.jp/rss/exblog/futakohts/atom.xml was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A//rss.exblog.jp/rss/exblog/futakohts/atom.xml