upstream minio {
        server minio1:9000;
        server minio2:9000;
        server minio3:9000;
        server minio4:9000;
    }

    # main minio
    server {
        listen       9000;
        listen  [::]:9000;
        server_name  localhost;

         # To allow special characters in headers
         ignore_invalid_headers off;
         # Allow any size file to be uploaded.

    upstream minio {
        server site1-minio1:9000;
        server site1-minio2:9000;
        server site1-minio3:9000;
        server site1-minio4:9000;
    }

    server {
        listen       9001;
        listen  [::]:9001;
        server_name  localhost;

        # To allow special characters in headers
        ignore_invalid_headers off;
        # Allow any size file to be uploaded.

    upstream minio {
        server site2-minio1:9000;
        server site2-minio2:9000;
        server site2-minio3:9000;
        server site2-minio4:9000;
    }

    server {
        listen       9002;
        listen  [::]:9002;
        server_name  localhost;

        # To allow special characters in headers
        ignore_invalid_headers off;
        # Allow any size file to be uploaded.

	ServerFirst bool

	// InstanceIP determines if echo will listen on the instance IP; otherwise, it will listen on wildcard
	InstanceIP bool

	// LocalhostIP determines if echo will listen on the localhost IP; otherwise, it will listen on wildcard
	LocalhostIP bool
}

// IsWorkloadOnly returns true if there is no service port specified for this Port.

	}

	// Opening a Listener should fail at this point too.
	ln2, err := Listen("tcp", "localhost:0")
	if err == nil {
		ln2.Close()
	}
	if errors.Is(err, syscall.EADDRINUSE) {
		t.Logf("Listen returned expected error: %v", err)
	} else {
		t.Errorf("unexpected error from Listen: %v\nwant: %v", err, syscall.EADDRINUSE)
	}

	regHandler.Do(func() {
		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			handlerData++
			fmt.Fprintf(w, "test")
			handlerData++
		})
	})
	ln, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("net.Listen: %v", err)
	}
	defer ln.Close()
	go http.Serve(ln, nil)
	handlerData++
	_, err = http.Get("http://" + ln.Addr().String())
	if err != nil {
		t.Fatalf("http.Get: %v", err)
	}

	// It doesn't matter whether we listen on "0.0.0.0", "::", or ""; go
	// treats them all the same.
	nodeIPs := []net.IP{net.IPv4zero}

	if !nodePortAddresses.MatchAll() {
		ips, err := nodePortAddresses.GetNodeIPs(proxyutil.RealNetwork{})
		if err == nil {
			nodeIPs = ips
		} else {

	if port <= 0 {
		return
	}
	mux := http.NewServeMux()
	var listener net.Listener
	var err error
	if listener, err = net.Listen("tcp", fmt.Sprintf(":%d", port)); err != nil {
		log.Errorf("unable to listen on socket: %v", err)
		return
	}
	exporter, err := monitoring.RegisterPrometheusExporter(nil, nil)
	if err != nil {
		log.Errorf("could not set up prometheus exporter: %v", err)

	flags.Uint64Var(&opts.peerPort, "peer-port", 0,
		"etcd peer port to use during migration operations. If unset defaults to 2380 or 2381 depending on <data-dir>.")
	flags.StringVar(&opts.peerListenUrls, "listen-peer-urls", "",
		"etcd --listen-peer-urls flag. If unset, fallbacks to LISTEN_PEER_URLS env and if unset defaults to http://localhost:<peer-port>.")
	flags.StringVar(&opts.peerAdvertiseUrls, "initial-advertise-peer-urls", "",

    ```

Das bewirkt, dass `tags` eine Liste ist, wenngleich es nichts über den Typ der Elemente der Liste aussagt.

## Listen mit Typ-Parametern als Felder

Aber Python erlaubt es, Listen mit inneren Typen, auch „Typ-Parameter“ genannt, zu deklarieren.

### `List` von `typing` importieren