404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=http%3A%2F%2Fdata.bnf.fr%2Ffr%2F12503658%2Fjohann_andre%2F&title=Johann+Andr%C3%A9+%281741-1799%29 was not found on this server. That’s all we know.