404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Ffr%2F14804482%2Fmonsieur_gobert%2F&title=Monsieur+Gobert+%28choriste+%28ut+3%29%2C+17..-18..+%29 was not found on this server. That’s all we know.