def perform_service_validate(
        self,
        ticket=None,
        service_url=None,
        headers=None,
        ):
        '''
        Fetch a response from the remote CAS `serviceValidate` endpoint.
        '''
        url = self._get_service_validate_url(ticket, service_url=service_url)
        logging.debug('[CAS] ServiceValidate URL: {}'.format(url))
        return self._perform_cas_call(url, ticket=ticket, headers=headers)
Fetch a response from the remote CAS `serviceValidate` endpoint.