404. That’s an error.

The requested URL /bookmarks/mark?op=edit&bkmk=https%3A%2F%2Fdata.bnf.fr%2Fen%2F13947929%2Fantonio_soler_sonates__clavier__si_bemol_majeur__no_3__r_338%2F&title=Sonates.+Clavier.+Si+b%C3%A9mol+majeur.+No+3.+R+338 was not found on this server. That’s all we know.