// Create a ServiceEntry to allow apps in this namespace to talk to the external service.
		if d.External.Namespace != nil {
			DeployExternalServiceEntry(cfg, ns, d.External.Namespace, false)
		}
	}

	return cfg.Apply(apply.NoCleanup)
}

func DeployExternalServiceEntry(cfg config.Factory, deployedNamespace, externalNamespace namespace.Instance, manuallyAllocate bool) config.Plan {

					if strings.HasPrefix(hn, "x-envoy-peer-metadata") {
						return fmt.Errorf("got unexpected proxy header: %v=%v", k, v)
					}
				}
				return nil
			})

			cdeployment.DeployExternalServiceEntry(t.ConfigIstio(), ns, apps.External.Namespace, false).
				ApplyOrFail(t, apply.CleanupConditionally)
			instance.CallOrFail(t, echo.CallOptions{
				Address: apps.External.All[0].Address(),