code: def init_get(self, request):
          
          self.request = request
          self.service = request.GET.get('service')
          self.renew = bool(request.GET.get('renew') and request.GET['renew'] != "False")
          self.gateway = request.GET.get('gateway')
          self.method = request.GET.get('method')
          self.ajax = settings.CAS_ENABLE_AJAX_AUTH and 'HTTP_X_AJAX' in request.META
          self.warn = request.GET.get('warn')
          if settings.CAS_FEDERATE:
              # here username and ticket are fetch from the session after a redirection from
              # FederateAuth.get
              self.username = request.session.get("federate_username")
              self.ticket = request.session.get("federate_ticket")
              if self.username:
                  del request.session["federate_username"]
              if self.ticket:
                  del request.session["federate_ticket"]
docs: Initialize GET received parameters
  
              :param django.http.HttpRequest request: The current request object