# File lib/casclient/frameworks/rails/filter.rb, line 153
          def logout(controller, service = nil)
            referer = service || controller.request.referer
            st = controller.session[:cas_last_valid_ticket]
            delete_service_session_lookup(st) if st
            controller.send(:reset_session)
            controller.send(:redirect_to, client.logout_url(referer))
          end