facebook oauth 2.0 on GAE

def facebook_authorization(request):

    url = "https://graph.facebook.com/oauth/authorize"
    params = urllib.urlencode({
        'client_id': settings.FACEBOOK_APP_ID,
        'redirect_uri': settings.FACEBOOK_REDIRECT_URI,
        'scope': 'offline_access,read_stream,publish_stream'
    })

    return redirect(url + '?' + params)

def facebook_verify(request):
    code = request.GET.get('code', None)

    if not code:
        return HttpResponse('Bad Request')

    url = 'https://graph.facebook.com/oauth/access_token?'

    params = urllib.urlencode({
        'client_id': settings.FACEBOOK_APP_ID,
        'redirect_uri': settings.FACEBOOK_REDIRECT_URI,
        'client_secret': settings.FACEBOOK_APP_SECRET,
        'code': code
    })

    result = urlfetch.fetch(url + params)

    if result.status_code == 200:
        response = cgi.parse_qs(result.content)
        access_token = response['access_token'][-1]

        graph = facebook.GraphAPI(access_token)
        profile = graph.get_object("me")