([#55479](https://github.com/kubernetes/kubernetes/pull/55479), [@ijc](https://github.com/ijc))

// Forwarder forwards all incoming HTTP requests to configured transport.
type Forwarder struct {
	RoundTripper http.RoundTripper
	PassHost     bool
	Logger       func(error)
	ErrorHandler func(http.ResponseWriter, *http.Request, error)

	// internal variables
	rewriter *headerRewriter
}

// NewForwarder creates an instance of Forwarder based on the provided list of configuration options

- Allowed `Label` section in vSphere e2e cloud provider configuration. ([#112427](https://github.com/kubernetes/kubernetes/pull/112427), [@gnufied](https://github.com/gnufied))

- Kubeadm: avoid panicing if the user has malformed the kubeconfig...

### Docs

* 📝 Add documentation for Behind a Proxy - Proxy Forwarded Headers, using `--forwarded-allow-ips="*"`. PR [#14028](https://github.com/fastapi/fastapi/pull/14028) by [@tiangolo](https://github.com/tiangolo).

    /**
     * Get the value for the key 'rate.limit.trusted.proxies'. <br>
     * The value is, e.g. 127.0.0.1,::1 <br>
     * comment: Comma-separated list of trusted proxy IPs. Only trust X-Forwarded-For/X-Real-IP from these IPs.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getRateLimitTrustedProxies();

    /**

	globalInternodeTransport http.RoundTripper

	globalRemoteTargetTransport http.RoundTripper

	globalDNSCache = &dnscache.Resolver{
		Timeout: 5 * time.Second,
	}

	globalForwarder *handlers.Forwarder

	globalTierConfigMgr *TierConfigMgr

	globalConsoleSrv *consoleapi.Server

	// handles service freeze or un-freeze S3 API calls.
	globalServiceFreeze atomic.Value

	// Only needed for tracking

	success = true

	// Make sure we remove any existing headers before
	// proxying the request to another node.
	for k := range w.Header() {
		w.Header().Del(k)
	}

	f := handlers.NewForwarder(&handlers.Forwarder{
		PassHost:     true,
		RoundTripper: ep.Transport,
		ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
			success = false
			if err != nil && !errors.Is(err, context.Canceled) {

	defer xioutil.SafeClose(out)
	top := make([]*metaCacheEntry, len(in))
	nDone := 0
	ctxDone := ctx.Done()

	// Use simpler forwarder.
	if len(in) == 1 {
		for {
			select {
			case <-ctxDone:
				return ctx.Err()
			case v, ok := <-in[0]:
				if !ok {
					return nil
				}
				select {
				case <-ctxDone:

	globalRemoteTargetTransport = NewRemoteTargetHTTPTransport(false)()
	globalProxyEndpoints = GetProxyEndpoints(globalEndpoints, globalRemoteTargetTransport)

	globalForwarder = handlers.NewForwarder(&handlers.Forwarder{
		PassHost:     true,
		RoundTripper: globalRemoteTargetTransport,
		Logger: func(err error) {
			if err != nil && !errors.Is(err, context.Canceled) {
				proxyLogIf(GlobalContext, err)
			}
		},
	})