404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fde%2F12000800%2Flibre_pensee_france%2F&title=Libre+pens%C3%A9e.+France was not found on this server. That’s all we know.