404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Ffr%2F10380986%2Fandre_vervoort%2F&title=Andr%C3%A9+Vervoort+%281865-1943%29 was not found on this server. That’s all we know.