using success_url

I can't seem to find success using success_url

If I try this in my urls.py file

url(r'^step2/', AnswersCreate.as_view(success_url='/requestform/success'), name='answers'),

and then in my view:

def form_valid(self, form):

        obj = form.save(commit=False)

        obj.created_by = self.request.user

        obj.save()

        return HttpResponseRedirect(self.get_success_url())

I get a successful save but it does not take me to the next url defined in success_url

Is there another way to do it, or what am I doing wrong?

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