code: def crl(request, pk):
      
      authenticated = request.user.is_authenticated
      authenticated = authenticated() if callable(authenticated) else authenticated
      if app_settings.CRL_PROTECTED and not authenticated:
          return HttpResponse(_('Forbidden'),
                              status=403,
                              content_type='text/plain')
      ca = crl.ca_model.objects.get(pk=pk)
      return HttpResponse(ca.crl,
                          status=200,
                          content_type='application/x-pem-file')
docs: returns CRL of a CA