wg.Add(1)
		go func() {
			defer wg.Done()
			gotIPs, err := DefaultResolver.lookupIPAddr(ctx, network, host)
			if err != nil {
				t.Errorf("lookupIPAddr(%v, %v): unexpected error: %v", network, host, err)
			}
			wantIPs := results[[2]string{network, host}]
			if !reflect.DeepEqual(gotIPs, wantIPs) {
				t.Errorf("lookupIPAddr(%v, %v): mismatched IPAddr results\n\tGot: %v\n\tWant: %v", network, host, gotIPs, wantIPs)
			}

	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
	defer cancel()
	var addrs []netip.Addr
	var lookupErr error
	if (len(lookupIPAddr) > 0) && (lookupIPAddr[0] != nil) {
		// if there are more than one lookup function, ignore all but first
		addrs, lookupErr = lookupIPAddr[0](ctx, host)
	} else {
		addrs, lookupErr = net.DefaultResolver.LookupNetIP(ctx, "ip", host)
	}
	if lookupErr != nil || len(addrs) == 0 {

	addrs, err := DefaultResolver.LookupIPAddr(context.Background(), host)
	if err != nil {
		return nil, err
	}
	ips := make([]IP, len(addrs))
	for i, ia := range addrs {
		ips[i] = ia.IP
	}
	return ips, nil
}

// LookupIPAddr looks up host using the local resolver.
// It returns a slice of that host's IPv4 and IPv6 addresses.

	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		goResolver.LookupIPAddr(ctx, "www.example.com")
	}
}

func BenchmarkGoLookupIPNoSuchHost(b *testing.B) {
	testHookUninstaller.Do(uninstallTestHooks)
	ctx := context.Background()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		goResolver.LookupIPAddr(ctx, "some.nonexistent")
	}
}

	return &url.URL{Scheme: schemeReq, Host: net.JoinHostPort(info.Hostname, portReq)}, proxyTransport, nil
}

func isProxyableHostname(ctx context.Context, hostname string) error {
	resp, err := net.DefaultResolver.LookupIPAddr(ctx, hostname)
	if err != nil {
		return err
	}

	if len(resp) == 0 {
		return fmt.Errorf("no addresses for hostname")
	}
	for _, host := range resp {
		if !host.IP.IsGlobalUnicast() {

		default:
			panic("unexpected network: " + net)
		}
	}
	if host == "" {
		return addrList{inetaddr(IPAddr{})}, nil
	}

	// Try as a literal IP address, then as a DNS name.
	ips, err := r.lookupIPAddr(ctx, net, host)
	if err != nil {
		return nil, err
	}
	// Issue 18806: if the machine has halfway configured
	// IPv6 such that it can bind on "::" (IPv6unspecified)

pkg net, method (*Resolver) LookupCNAME(context.Context, string) (string, error)
pkg net, method (*Resolver) LookupHost(context.Context, string) ([]string, error)
pkg net, method (*Resolver) LookupIPAddr(context.Context, string) ([]IPAddr, error)
pkg net, method (*Resolver) LookupMX(context.Context, string) ([]*MX, error)
pkg net, method (*Resolver) LookupNS(context.Context, string) ([]*NS, error)

		{"(*Resolver).LookupAddr", Method, 8},
		{"(*Resolver).LookupCNAME", Method, 8},
		{"(*Resolver).LookupHost", Method, 8},
		{"(*Resolver).LookupIP", Method, 15},
		{"(*Resolver).LookupIPAddr", Method, 8},
		{"(*Resolver).LookupMX", Method, 8},
		{"(*Resolver).LookupNS", Method, 8},
		{"(*Resolver).LookupNetIP", Method, 18},
		{"(*Resolver).LookupPort", Method, 8},