404. That’s an error.
The requested URL /bookmarks/mark?op=edit&bkmk=http://weekly.ascii.jp/elem/000/000/330/330541/&title=%E3%83%9F%E3%82%B9%E3%82%BF%E3%83%BC%E3%83%89%E3%83%BC%E3%83%8A%E3%83%84%E3%81%A7%E6%BF%80%E5%A3%B2%E3%82%8C%E3%81%97%E3%81%9F%E3%80%8C%E3%82%B3%E3%83%83%E3%83%88%E3%83%B3%E3%82%B9%E3%83%8E%E3%83%BC%E3%82%AD%E3%83%A3%E3%83%B3%E3%83%87%E3%82%A3%E3%80%8D%E3%81%8C%E4%BB%8A%E5%B9%B4%E3%82%82%EF%BC%81%E6%96%B0%E5%91%B3%E3%81%AF%E6%8A%B9%E8%8C%B6%E3%81%A8%E3%83%81%E3%83%A7%E3%82%B3%E3%83%AC%E3%83%BC%E3%83%88
was not found on this server. That’s all we know.