相关疑难解决方法(0)

我用它来登录用户:

def login_backend(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(username=username, password=password)
        if user is not None:
            login(request, user)
            request.session.set_expiry(300)
            return HttpResponseRedirect('/overview/')
        else:
            return HttpResponseRedirect('/login_backend/')
    else:
        return render_to_response('login_backend.html', context_instance=RequestContext(request))

我希望会话在5分钟后过期,因此我request.session.set_expiry(300)在上面的视图中添加了.但会议永远不会到期.我究竟做错了什么？