404. That’s an error.
The requested URL /add?feedurl=http%3A//xn--8-kq6a1yx1nfq8b.seesaa.net/index20.rdf was not found on this server. That’s all we know.
/add?feedurl=http%3A//xn--8-kq6a1yx1nfq8b.seesaa.net/index20.rdf