message: like the default backend, use no probe.
diff: @@ -23,12 +23,10 @@ acl purge {
  sub vcl_init {
  new www_dir = dynamic.director(
  port = "${VARNISH_BACKEND_PORT:-8080}",
  - probe = www_probe,
  whitelist = purge,
  ttl = 60s);
  }
  -
  # This configuration is optimized for Drupal hosting:
  # Respond to incoming requests.
  sub vcl_recv {
  