}
	// Use bearer token
	aud := tokenAudiences
	isMCP := strings.HasSuffix(opts.Xds, ".googleapis.com") || strings.HasSuffix(opts.Xds, ".googleapis.com:443")
	if isMCP {
		// Special credentials handling when using ASM Managed Control Plane.
		mem, err := getHubMembership(ctx, kubeClient)
		if err != nil {
			return nil, fmt.Errorf("failed to query Hub membership: %w", err)
		}
		aud = []string{mem.WorkloadIdentityPool}
	}

		fn := authenticateNode
		b.ResetTimer()
		b.ReportAllocs()
		for i := 0; i < b.N; i++ {
			fn(creds.AccessKey, creds.SecretKey, "aud")
		}
	})
	b.Run("cached", func(b *testing.B) {
		fn := newCachedAuthToken()
		b.ResetTimer()
		b.ReportAllocs()
		for i := 0; i < b.N; i++ {
			fn("aud")
		}
	})

		if debugPrint {
			fmt.Printf("handler: Got Connect Req %+v\n", cReq)
		}
		writeErr(remote.handleIncoming(ctx, conn, cReq))
	}
}

// AuthFn should provide an authentication string for the given aud.
type AuthFn func(aud string) string

// Connection will return the connection for the specified host.
// If the host does not exist nil will be returned.
func (m *Manager) Connection(host string) *Connection {

	remoteHost := hosts[1]
	local, err := NewManager(context.Background(), ManagerOptions{
		Dialer:       dialer.DialContext,
		Local:        localHost,
		Hosts:        hosts,
		AddAuth:      func(aud string) string { return aud },
		AuthRequest:  dummyRequestValidate,
		BlockConnect: connReady,
	})
	errFatal(err)

	// 1: Echo
	errFatal(local.RegisterSingleHandler(handlerTest, func(payload []byte) ([]byte, *RemoteErr) {

	// case sensitive
	audValues, ok := policy.GetValuesFromClaims(claims, audClaim)
	if !ok {
		return errors.New("STS JWT Token has `aud` claim invalid, `aud` must match configured OpenID Client ID")
	}
	if !audValues.Contains(pCfg.ClientID) {
		// if audience claims is missing, look for "azp" claims.
		// OPTIONAL. Authorized party - the party to which the ID

		manager, err := NewManager(ctx, ManagerOptions{
			Dialer: dialer.DialContext,
			Local:  host,
			Hosts:  hosts,
			AuthRequest: func(r *http.Request) error {
				return nil
			},
			AddAuth:      func(aud string) string { return aud },
			BlockConnect: ready,
		})
		if err != nil {
			return nil, err
		}
		m := mux.NewRouter()
		m.Handle(RoutePath, manager.Handler())
		res.Managers = append(res.Managers, manager)