404. That’s an error.
The requested URL /add?feedurl=http://xn--sckxc854l9jve1vp0c.tokyo/yukihada-drop/ror.xml was not found on this server. That’s all we know.
/add?feedurl=http://xn--sckxc854l9jve1vp0c.tokyo/yukihada-drop/ror.xml