404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F12018436%2Fmansueto_bernardi%2F&title=Mansueto+Bernardi+%281888-1966%29 was not found on this server. That’s all we know.