def login(request):
    if request.method == 'GET':
        print(request.META['HTTP_ACCEPT'])
        return render(request, 'polls/login.html')

    if request.method == 'POST':
        print(request.META['HTTP_ACCEPT'])
        loginJson = request.body.decode("utf-8")
        loginData = json.loads(loginJson)
        username = loginData['username']
        password = loginData['password']

        calledUser = Client.objects.get(name=username)

        if calledUser is None:
            t = loader.get_template('polls/fail.html')
            reqContext = RequestContext(request, {
                'username': username,
            })
            return HttpResponse(t.render(reqContext))
        else:
            if calledUser.password == password:
                return redirect('http://localhost:8000/polls/login/startpage/')
                # return render(request, 'polls/startpage.html', content_type="text/html")
            else:
                return redirect('http://localhost:8000/polls/login/fail/')

def startPage(request):
    if request.method == 'GET':
        print(request.META['HTTP_ACCEPT'])
        return render(request, 'polls/startpage.html')

urlpatterns = [
    # ...
    url(r'^login/$', views.login, name='login'),
    url(r'^login/startpage/$', views.startPage, name='start'),
    url(r'^login/fail/$', views.failPage, name='fail'),
    # ...
]

text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
[05/Nov/2016 07:25:17] "GET /polls/login/ HTTP/1.1" 200 1141
[05/Nov/2016 07:25:17] "GET /static/login.css HTTP/1.1" 304 0
[05/Nov/2016 07:25:17] "GET /static/login.js HTTP/1.1" 304 0
text/html, */*; q=0.01
[05/Nov/2016 07:25:23] "POST /polls/login/ HTTP/1.1" 302 0
text/html, */*; q=0.01
[05/Nov/2016 07:25:23] "GET /polls/login/startpage/ HTTP/1.1" 200 583