401. That’s an error.

Your client does not have permission to the requested URL /books?hl=fr&lr=&id=pRThAQAAQBAJ&oi=fnd&pg=PA263&dq=vengeance+and+society&ots=H9pDLlSJQ1&sig=_Equyce7keKNwqZbjz3vEz5Ikac&redir_esc=y. That’s all we know.