CODE EXAMPLE FOR PYTHON

django login required

def login_view(request):
    if request.method == 'GET':
        cache.set('next', request.GET.get('next', None))

    if request.method == 'POST':
        # do your checks here

        login(request, user)

        next_url = cache.get('next')
        if next_url:
            cache.delete('next')
            return HttpResponseRedirect(next_url)

    return render(request, 'account/login.html')