'get_cache_key keys differ by fully-qualified URL instead of path'

def test_cache_key_varies_by_url(self):

    request1 = self.factory.get(self.path, HTTP_HOST='sub-1.example.com')
    learn_cache_key(request1, HttpResponse())
    request2 = self.factory.get(self.path, HTTP_HOST='sub-2.example.com')
    learn_cache_key(request2, HttpResponse())
    self.assertNotEqual(get_cache_key(request1), get_cache_key(request2))
