code: def get_cancel_url(self):
          
          if self.cancel_view:
              url = self.bundle.get_view_url(self.cancel_view,
                                              self.request.user, {},
                                              self.kwargs)
          else:
              url = self.request.build_absolute_uri()
  
          return self.customized_return_url(url)
docs: Returns the cancel url for this view.
  
          if `self.cancel_view` is None the current url will
          be used. Otherwise the get_view_url will be called with
          the current bundle using `self.cancel_view` as the
          view name.