docs: def get_redirect(self, authorization_url, extra_params):
          """
          Returns a ``HttpResponseRedirect`` object to redirect the user
          to the URL the OAuth provider handles authorization.
          """
          request_token = self._get_request_token()
          params = {'oauth_token': request_token['oauth_token'],
                    'oauth_callback': self.request.build_absolute_uri(
                        self.callback_url)}
          params.update(extra_params)
          url = authorization_url + '?' + urlencode(params)
          return HttpResponseRedirect(url)