return strings.Split(portsString, ",")
}

func dedupPorts(ports []string) []string {
	dedup := make(map[string]bool)
	keys := []string{}

	for _, port := range ports {
		if !dedup[port] {
			dedup[port] = true
			keys = append(keys, port)
		}
	}
	return keys
}

func parsePort(portStr string) (uint16, error) {
	port, err := strconv.ParseUint(strings.TrimSpace(portStr), 10, 16)
	if err != nil {

			}
			port, err = strconv.Atoi(portStr)
			if err != nil {
				logger.Fatal(fmt.Errorf("invalid arguments passed to --sftp=%s (%v)", arg, err), "unable to start SFTP server")
			}
			if port < 1 || port > 65535 {
				logger.Fatal(fmt.Errorf("invalid arguments passed to --sftp=%s, (port number must be between 1 to 65535)", arg), "unable to start SFTP server")
			}

        ```

* `--bind`: Das teilt Gunicorn die IP und den Port mit, welche abgehört werden sollen, wobei ein Doppelpunkt (`:`) verwendet wird, um die IP und den Port zu trennen.
    * Wenn Sie Uvicorn direkt ausführen würden, würden Sie anstelle von `--bind 0.0.0.0:80` (die Gunicorn-Option) stattdessen `--host 0.0.0.0` und `--port 80` verwenden.

     */
    // TODO: why is this public?
    public TeredoInfo(
        @CheckForNull Inet4Address server, @CheckForNull Inet4Address client, int port, int flags) {
      checkArgument(
          (port >= 0) && (port <= 0xffff), "port '%s' is out of range (0 <= port <= 0xffff)", port);
      checkArgument(
          (flags >= 0) && (flags <= 0xffff),
          "flags '%s' is out of range (0 <= flags <= 0xffff)",
          flags);

      when {
        ':' in addressHostname -> append("[").append(addressHostname).append("]")
        else -> append(addressHostname)
      }
      if (address.url.port != socketAddress.port || addressHostname == socketHostname) {
        append(":")
        append(address.url.port)
      }

      if (addressHostname != socketHostname) {
        when (proxy) {
          Proxy.NO_PROXY -> append(" at ")

 *
 */
public class ApiExtractorTest extends PlainTestCase {
    final int port = 9876;

    final String ATTR_NAME = "filedata";

    private TestApiExtractorServer server;

    private ApiExtractor extractor;

    @Override
    protected void setUp() throws Exception {
        super.setUp();

        server = new TestApiExtractorServer(port);
        server.start();

        extractor = new ApiExtractor();

                          "on_match": {
                            "matcher": {
                              "matcher_tree": {
                                "input": {
                                  "name": "port",
                                  "typed_config": {
                                    "@type": "type.googleapis.com/envoy.extensions.matching.common_inputs.network.v3.DestinationPortInput"
                                  }

			"-p", iptablesconstants.TCP,
			"-i", "lo",
			"-j", "ACCEPT")
		// CLI: -A ISTIO_PRERT -p tcp -m tcp --dport <INPORT> -m mark ! --mark 0x539/0xfff -j TPROXY --on-port <INPORT> --on-ip 127.0.0.1 --tproxy-mark 0x111/0xfff
		//
		// DESC: Anything heading to <INPORT> that does not have the mark, TPROXY to ztunnel inbound port <INPORT>
		iptablesBuilder.AppendRule(
			iptableslog.UndefinedCommand, ChainInpodPrerouting, iptablesconstants.MANGLE,

		req.Header.Set(xForwardedHost, req.Host)
	}
}

func forwardedPort(req *http.Request) string {
	if req == nil {
		return ""
	}

	if _, port, err := net.SplitHostPort(req.Host); err == nil && port != "" {
		return port
	}

	if req.TLS != nil {
		return "443"
	}

	return "80"

            }
            PROTOCOL_HANDLERS.clear();
            Handler.factory = factory;
        }
    }

    /**
     * Returns the default HTTP port.
     *
     * @return An <code>int</code> containing the default HTTP port.
     */
    protected int getDefaultPort() {
        return DEFAULT_HTTP_PORT;
    }

    protected URLConnection openConnection(URL url) throws IOException {