code: def post(self, request):
          
          self.request = request
          self.target = request.GET.get('TARGET')
          self.root = etree.fromstring(request.body)
          try:
              self.ticket = self.process_ticket()
              expire_instant = (self.ticket.creation +
                                timedelta(seconds=self.ticket.VALIDITY)).isoformat()
              params = {
                  'IssueInstant': timezone.now().isoformat(),
                  'expireInstant': expire_instant,
                  'Recipient': self.target,
                  'ResponseID': utils.gen_saml_id(),
                  'username': self.ticket.username(),
                  'attributes': self.ticket.attributs_flat(),
                  'auth_date': self.ticket.user.last_login.replace(microsecond=0).isoformat(),
                  'is_new_login': 'true' if self.ticket.renew else 'false'
  
              }
              logger.info(
                  "SamlValidate: ticket %s validated for user %s on service %s." % (
                      self.ticket.value,
                      self.ticket.user.username,
                      self.ticket.service
                  )
              )
              logger.debug(
                  "SamlValidate: User attributes are:\n%s" % pprint.pformat(self.ticket.attributs)
              )
  
              return render(
                  request,
                  "cas_server/samlValidate.xml",
                  params,
                  content_type="text/xml; charset=utf-8"
              )
          except SamlValidateError as error:
              logger.warning("SamlValidate: validation error: %s %s" % (error.code, error.msg))
              return error.render(request)
docs: method called on POST request on this view
  
              :param django.http.HttpRequest request: The current request object
              :return: the rendering of ``cas_server/samlValidate.xml`` if no error is raised,
                  else the rendering of ``cas_server/samlValidateError.xml``.
              :rtype: django.http.HttpResponse