need := tpl.MissingParams(s.Params())
			needFrom := need.Contains(param.From.String())
			needTo := need.Contains(param.To.String())

			if needFrom && needTo {
				out.needFromAndTo = append(out.needFromAndTo, s)
			} else if needFrom {
				out.needFrom = append(out.needFrom, s)
			} else if needTo {
				out.needTo = append(out.needTo, s)
			} else {
				// No well-known parameters are missing.

Das bedeutet, dass anstelle des normalen Prozesses, bei dem Benutzer Requests an Ihre API senden, **Ihre API** (oder Ihre Anwendung) **Requests an deren System** (an deren API, deren Anwendung) senden könnte.

Das wird normalerweise als **Webhook** bezeichnet.

## Webhooks-Schritte

        while (count >= 0 && !output.contains("modified: ")) {
            println "Waiting for 'Thing.java' modification detection ($count)..."
            Thread.sleep(100)
            count--
        }
        sendEOT()

        then:
        cancelsAndExits()

        when:
        def classloader = new URLClassLoader([javaClassFile("").toURI().toURL()] as URL[])

        then:

func (m *Map[K, V]) InOrder() *Iterator[K, V] {
	sender, receiver := chans.Ranger[keyValue[K, V]]()
	var f func(*node[K, V]) bool
	f = func(n *node[K, V]) bool {
		if n == nil {
			return true
		}
		// Stop sending values if sender.Send returns false,
		// meaning that nothing is listening at the receiver end.
		return f(n.left) &&
                        sender.Send(keyValue[K, V]{n.key, n.val}) &&
			f(n.right)
	}

## Nachrichten erwarten und Nachrichten senden

In Ihrer WebSocket-Route können Sie Nachrichten `await`en und Nachrichten senden.

```Python hl_lines="48-52"
{!../../../docs_src/websockets/tutorial001.py!}
```

Sie können Binär-, Text- und JSON-Daten empfangen und senden.

## Es ausprobieren

Wenn Ihre Datei `main.py` heißt, führen Sie Ihre Anwendung so aus:

func (m *Map[K, V]) InOrder() *Iterator[K, V] {
	sender, receiver := chans_Ranger[keyValue[K, V]]()
	var f func(*node[K, V]) bool
	f = func(n *node[K, V]) bool {
		if n == nil {
			return true
		}
		// Stop sending values if sender.Send returns false,
		// meaning that nothing is listening at the receiver end.
		return f(n.left) &&
			sender.Send(keyValue[K, V]{n.key, n.val}) &&
			f(n.right)
	}
	go func() {

func (m *Map[K, V]) InOrder() *Iterator[K, V] {
	sender, receiver := chans_Ranger[keyValue[K, V]]()
	var f func(*node[K, V]) bool
	f = func(n *node[K, V]) bool {
		if n == nil {
			return true
		}
		// Stop sending values if sender.Send returns false,
		// meaning that nothing is listening at the receiver end.
		return f(n.left) &&
                        sender.Send(keyValue[K, V]{n.key, n.val}) &&
			f(n.right)
	}

        then:
        noExceptionThrown()

        when:
        if (inputBefore) {
            stdinPipe << inputBefore
        }
        if (flushBefore) {
            stdinPipe.flush()
        }
        sendEOT()

        then:
        ConcurrentTestUtil.poll(buildTimeout, 0.5) {
            assert !gradle.isRunning()
        }

        where:

	if err != nil {
		return nil, nil, err
	}

	return encapsulatedKey, &Sender{
		kem:            kem,
		aead:           aead,
		sharedSecret:   sharedSecret,
		suiteID:        suiteID,
		key:            key,
		baseNonce:      baseNonce,
		exporterSecret: exporterSecret,
	}, nil
}

func (s *Sender) nextNonce() []byte {
	nonce := s.seqNum.bytes()[16-s.aead.NonceSize():]

Você pode declarar o tipo de um parâmetro na função usando as anotações padrões do Python:

```Python hl_lines="7"
{!../../../docs_src/path_params/tutorial002.py!}
```

Nesse caso, `item_id` está sendo declarado como um `int`.

!!! check "Verifique"
	Isso vai dar à você suporte do seu editor dentro das funções, com verificações de erros, autocompletar, etc.