404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=http%3A%2F%2Fkanako.cocomo.jp%2F%3Fp%3D747&title=%E3%81%B6%E3%81%A9%E3%81%86%E5%A4%A7%E7%A6%8F%E2%99%A1 was not found on this server. That’s all we know.