code: def unsubscribe_url(self):
          
          server_relative = ('%s?s=%s' % (reverse('tidings.unsubscribe',
                                                  args=[self.pk]),
                                          self.secret))
          return 'https://%s%s' % (Site.objects.get_current().domain,
                                   server_relative)
docs: Return the absolute URL to visit to delete me.