def clean_url(self):
        url = self.cleaned_data['url']
        if 'url' in self.changed_data:
            if not url.endswith('/'):
                url += '/'
            URLDoesNotExistValidator()(url)
        return url
Validate the input for field *url* checking if the specified
dataset/ETHPy150Open django-oscar/django-oscar/src/oscar/apps/dashboard/pages/forms.py/PageUpdateForm.clean_url