want bool
	}{
		{
			"source namespace match",
			args{
				match: &v1alpha3.TLSMatchAttributes{
					SourceNamespace: "foo",
				},
				namespace: "foo",
			},
			true,
		},
		{
			"source namespace not match",
			args{
				match: &v1alpha3.TLSMatchAttributes{
					SourceNamespace: "foo",
				},
				namespace: "bar",
			},
			false,
		},
		{
			"source namespace not match when empty",

			errs = appendErrors(errs, validateGatewayNames(match.Gateways, false))
			if match.SourceNamespace != "" {
				if !labels.IsDNS1123Label(match.SourceNamespace) {
					errs = appendErrors(errs, fmt.Errorf("sourceNamespace match %s is invalid", match.SourceNamespace))
				}
			}
		}
	}

	return
}

		vs := config.Spec.(*networking.VirtualService)
		for _, httpRoute := range vs.Http {
			for _, match := range httpRoute.Match {
				// if vs has source match, not cacheable
				if len(match.SourceLabels) > 0 || match.SourceNamespace != "" {
					return false
				}
			}
		}
	}

	return true
}

func extractNamespaceForKubernetesService(hostname string) (string, error) {
	ih := strings.Index(hostname, ".svc.")
	if ih < 0 {