404. That’s an error.

The requested URL /bookmarks/mark?op=add&bkmk=http%3A%2F%2Fkamo-log.com%2Faimisu%2F158-3%2Fattachment%2F2021y07m30d_212325357%2F&title=2021y07m30d_212325357 was not found on this server. That’s all we know.