401. That’s an error.

Your client does not have permission to the requested URL /books?id=Dfw9jdqnsukC&pg=PA41&lpg=PA41&dq=la+vengeance+comme+sentiment&source=bl&ots=84ZiKLg9iy&sig=GFaZqYfNO_hmewm5baLw_iFQs70&hl=fr&sa=X&ei=D8pxVLCSKITgatblgdAL&redir_esc=y. That’s all we know.