code: def perform_proxy(self, proxy_ticket, headers=None):
          '''
          Fetch a response from the remote CAS `proxy` endpoint.
          '''
          url = self._get_proxy_url(ticket=proxy_ticket)
          logging.debug('[CAS] Proxy URL: {}'.format(url))
          return self._perform_cas_call(
              url,
              ticket=proxy_ticket,
              headers=headers,
              f perform_proxy(self, proxy_ticket, headers=None):
          '''
          Fetch a response from the remote CAS `proxy` endpoint.
          '''
          url = self._get_proxy_url(ticket=proxy_ticket)
          logging.debug('[CAS] Proxy URL: {}'.format(url))
          return self._perform_cas_call(
              url,
              ticket=proxy_ticket,
              headers=headers,
              )
docs: Fetch a response from the remote CAS `proxy` endpoint.