d.port = sa.(*syscall.SockaddrInet4).Port
	return d, nil
}

func (d *DelayedListener) Address() string {
	return net.JoinHostPort("127.0.0.1", strconv.Itoa(d.port))
}

func (d *DelayedListener) Listen() error {
	if err := syscall.Listen(d.fd, 128); err != nil {
		return nil
	}
	return nil
}

func (d *DelayedListener) Close() error {
	if err := syscall.Close(d.fd); err != nil {
		return nil
	}
	return nil
}

Ich zeige Ihnen einige der wichtigsten Konzepte, die Sie beim Deployment einer **FastAPI**-Anwendung wahrscheinlich berücksichtigen sollten (obwohl das meiste davon auch für jede andere Art von Webanwendung gilt).

class XlaActivityLoggingListener final : public XlaActivityListener {
 public:
  Status Listen(
      const XlaAutoClusteringActivity& auto_clustering_activity) override {
    if (!IsEnabled()) {
      VLOG(3) << "Logging XlaAutoClusteringActivity disabled";
      return absl::OkStatus();
    }

    return absl::OkStatus();
  }

  Status Listen(
      const XlaJitCompilationActivity& jit_compilation_activity) override {

	if runtime.GOOS != "linux" {
		t.Skip()
	}

	l, err := net.Listen("tcp", "localhost:0") // ask kernel for a free port.
	if err != nil {
		t.Fatal(err)
	}
	defer l.Close()

	port := l.Addr().(*net.TCPAddr).Port

	testCases := []struct {
		host        string
		port        int
		expectedErr error
	}{
		{"", port, fmt.Errorf("listen tcp :%v: bind: address already in use", port)},

// Note: The check method tries to listen on given port and closes it.
// It is possible to have a disconnected client in this tiny window of time.
func CheckPortAvailability(host, port string, opts TCPOptions) (err error) {
	lc := &net.ListenConfig{}

	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()

	l, err := lc.Listen(ctx, "tcp", net.JoinHostPort(host, port))
	if err != nil {

	return nil
}

// Listen wraps [syscall.Listen].
func (sw *Switch) Listen(s syscall.Handle, backlog int) (err error) {
	so := sw.sockso(s)
	if so == nil {
		return syscall.Listen(s, backlog)
	}
	sw.fmu.RLock()
	f, _ := sw.fltab[FilterListen]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return err
	}
	so.Err = syscall.Listen(s, backlog)

		if canListenTCP4OnLoopback {
			if ln, err := net.Listen("tcp4", "127.0.0.1:0"); err == nil {
				return ln, nil
			}
		}
		if canListenTCP6OnLoopback {
			return net.Listen("tcp6", "[::1]:0")
		}
	case "tcp4":
		if canListenTCP4OnLoopback {
			return net.Listen("tcp4", "127.0.0.1:0")
		}
	case "tcp6":
		if canListenTCP6OnLoopback {
			return net.Listen("tcp6", "[::1]:0")
		}
	case "unix", "unixpacket":

  return ForEachListener([&](XlaActivityListener* listener) {
    return listener->Listen(auto_clustering_activity);
  });
}

Status BroadcastXlaActivity(
    XlaJitCompilationActivity jit_compilation_activity) {
  return ForEachListener([&](XlaActivityListener* listener) {
    return listener->Listen(jit_compilation_activity);
  });
}

	return nil
}

// Listen wraps syscall.Listen.
func (sw *Switch) Listen(s, backlog int) (err error) {
	so := sw.sockso(s)
	if so == nil {
		return syscall.Listen(s, backlog)
	}
	sw.fmu.RLock()
	f := sw.fltab[FilterListen]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {
		return err
	}
	so.Err = syscall.Listen(s, backlog)
	if err = af.apply(so); err != nil {

		} else if parsedIP.To4() != nil {
			ipBind = "tcp4"
		}
	}
	ln, err := tls.Listen(ipBind, net.JoinHostPort(ip, strconv.Itoa(port)), cfg)
	if err != nil {
		return nil, 0, err
	}
	port = ln.Addr().(*net.TCPAddr).Port
	return ln, port, nil
}

func listenOnUDS(uds string) (net.Listener, error) {
	_ = os.Remove(uds)
	ln, err := net.Listen("unix", uds)
	if err != nil {
		return nil, err
	}

	return ln, nil
}