404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Ftemp-work%2Fc4f351fd09eea67b5471ee99e6429c7f%2F&title=Les+vers+que+je+dis%2C+pourquoi+ne+les+diriez-vous+pas+%3F was not found on this server. That’s all we know.