local string

	// Validate incoming requests.
	authRequest func(r *http.Request) error
}

// ManagerOptions are options for creating a new grid manager.
type ManagerOptions struct {
	Dialer       ContextDialer               // Outgoing dialer.
	Local        string                      // Local host name.
	Hosts        []string                    // All hosts, including local in the grid.

var globalGridStart = make(chan struct{})

func initGlobalGrid(ctx context.Context, eps EndpointServerPools) error {
	hosts, local := eps.GridHosts()
	g, err := grid.NewManager(ctx, grid.ManagerOptions{
		Dialer:       grid.ContextDialer(xhttp.DialContextWithLookupHost(globalDNSCache.LookupHost, xhttp.NewInternodeDialContext(rest.DefaultTimeout, globalTCPOptions))),
		Local:        local,
		Hosts:        hosts,

// NewInternodeDialContext configures a custom dialer for internode communications
func NewInternodeDialContext(dialTimeout time.Duration, _ TCPOptions) DialContext {
	return func(ctx context.Context, network, addr string) (net.Conn, error) {
		dialer := &net.Dialer{
			Timeout: dialTimeout,
		}
		return dialer.DialContext(ctx, network, addr)
	}

// NewInternodeDialContext setups a custom dialer for internode communication
func NewInternodeDialContext(dialTimeout time.Duration, opts TCPOptions) DialContext {
	return func(ctx context.Context, network, addr string) (net.Conn, error) {
		dialer := &net.Dialer{
			Timeout: dialTimeout,
			Control: setTCPParametersFn(opts),
		}
		return dialer.DialContext(ctx, network, addr)
	}