404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=http%3A%2F%2Fdata.bnf.fr%2Ffr%2F16269952%2Fpierre_dupont%2F&title=Pierre+Dupont+%28g%C3%A9n%C3%A9alogiste%29 was not found on this server. That’s all we know.