```Python hl_lines="2  6-8"
{!../../docs_src/advanced_middleware/tutorial002.py!}
```

Die folgenden Argumente werden unterstützt:

* `allowed_hosts` – Eine Liste von Domain-Namen, die als Hostnamen zulässig sein sollten. Wildcard-Domains wie `*.example.com` werden unterstützt, um Subdomains zu matchen. Um jeden Hostnamen zu erlauben, verwenden Sie entweder `allowed_hosts=["*"]` oder lassen Sie diese Middleware weg.

				}
				for _, addr := range addrs {
					domainIPs.Add(addr)
				}
			}
			domainIPs.Add(endpoint)
		}
		updateDomainIPs(domainIPs)
	} else {
		// Add found interfaces IP address to global domain IPS,
		// loopback addresses will be naturally dropped.
		domainIPs := mustGetLocalIP4()
		for _, host := range globalEndpoints.Hostnames() {
			domainIPs.Add(host)
		}
		updateDomainIPs(domainIPs)
	}

		secretItemColumns = append(secretItemColumns, "TRUST DOMAIN")
	}
	tw := new(tabwriter.Writer).Init(w.w, 0, 5, 5, ' ', 0)
	fmt.Fprintln(tw, strings.Join(secretItemColumns, "\t"))
	for _, s := range secrets {
		if includeConfigType {
			s.Name = fmt.Sprintf("secret/%s", s.Name)
		}
		// If all secrets have a trust domain, we are probably dealing with trust domain federation, so print trust domains.

{* ../../docs_src/advanced_middleware/tutorial002.py hl[2,6:8] *}

The following arguments are supported:

* `allowed_hosts` - A list of domain names that should be allowed as hostnames. Wildcard domains such as `*.example.com` are supported for matching subdomains. To allow any hostname either use `allowed_hosts=["*"]` or omit the middleware.

	if vhRoute == nil {
		return false
	}

	// Infer from VirtualHost domains matching <service>.<namespace>.svc.cluster.local
	re := regexp.MustCompile(`(?P<service>[^\.]+)\.(?P<namespace>[^\.]+)\.svc\.cluster\.local$`)
	for _, domain := range vh.Domains {
		ss := re.FindStringSubmatch(domain)
		if ss != nil {
			if ss[1] == svc.ObjectMeta.Name && ss[2] == svc.ObjectMeta.Namespace {
				return true

            --set policy.enable=false \
            --set global.istioNamespace=istio-master
```

### Gateways

A cluster may use multiple Gateways, each with a different load balancer IP, domains and certificates.

Since the domain certificates are stored in the gateway namespace, it is recommended to keep each
gateway in a dedicated namespace and restrict access.

	// Captures if root credentials are set via ENV.
	globalCredViaEnv bool

	globalPublicCerts []*x509.Certificate

	globalDomainNames []string      // Root domains for virtual host style requests
	globalDomainIPs   set.StringSet // Root domain IP address(s) for a distributed MinIO deployment

	globalOperationTimeout       = newDynamicTimeout(10*time.Minute, 5*time.Minute) // default timeout for general ops

	}
	u := &url.URL{
		Host:   r.Host,
		Path:   path.Join(SlashSeparator, bucket, object),
		Scheme: proto,
	}
	// If domain is set then we need to use bucket DNS style.
	for _, domain := range domains {
		if strings.HasPrefix(r.Host, bucket+"."+domain) {
			u.Path = path.Join(SlashSeparator, object)
			break
		}
	}
	return u.String()
}

  # to work in an offline environment:
  # https://github.com/coredns/coredns/issues/2494#issuecomment-457215452
  # CoreDNS should handle those domains and answer with NXDOMAIN instead of SERVFAIL
  # otherwise pods stops trying to resolve the domain.
  if [ "${IP_FAMILY}" = "ipv6" ] || [ "${IP_FAMILY}" = "dual" ]; then
    # Get the current config
    original_coredns=$(kubectl get -oyaml -n=kube-system configmap/coredns)

### API Change

- Allow for Pod search domains to be a single dot "." or contain an underscore "_" ([#127167](https://github.com/kubernetes/kubernetes/pull/127167), [@adrianmoisey](https://github.com/adrianmoisey)) [SIG Apps, Network and Testing]