// Simulate external change by directly calling setProperties (another WrapperProperties instance)
            Properties externalProps = new Properties();
            externalProps.setProperty("initial.key", "externally.modified");
            externalProps.setProperty("external.key", "external.value");
            model.setProperties(externalProps);

Откройте браузер по адресу: <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

Вы увидите JSON-ответ вида:

```JSON
{"message": "Hello World"}
```

### Интерактивная документация API { #interactive-api-docs }

Теперь перейдите по адресу: <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

* <a href="https://www.uvicorn.dev/" class="external-link" target="_blank">Uvicorn</a> : un serveur ASGI haute performance.
* <a href="https://hypercorn.readthedocs.io/" class="external-link" target="_blank">Hypercorn</a> : un serveur
  ASGI compatible avec HTTP/2 et Trio entre autres fonctionnalités.
* <a href="https://github.com/django/daphne" class="external-link" target="_blank">Daphne</a> : le serveur ASGI
  conçu pour Django Channels.

/// tip | Совет

Сам обратный вызов — это всего лишь HTTP-запрос.

Реализуя обратный вызов, вы можете использовать, например, <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a> или <a href="https://requests.readthedocs.io/" class="external-link" target="_blank">Requests</a>.

///

## Напишите код документации обратного вызова { #write-the-callback-documentation-code }

Using it led to the creation of several Flask full-stack generators. These are the main stacks I (and several external teams) have been using up to now:

* <a href="https://github.com/tiangolo/full-stack" class="external-link" target="_blank">https://github.com/tiangolo/full-stack</a>
* <a href="https://github.com/tiangolo/full-stack-flask-couchbase" class="external-link" target="_blank">https://github.com/tiangolo/full-stack-flask-couchbase</a>

**Typer** є молодшим братом FastAPI. І це **FastAPI для CLI**. ⌨️ 🚀

## Вимоги

FastAPI стоїть на плечах гігантів:

* <a href="https://www.starlette.dev/" class="external-link" target="_blank">Starlette</a> для web частини.
* <a href="https://docs.pydantic.dev/" class="external-link" target="_blank">Pydantic</a> для частини даних.

     *
     * @param external
     *            If {@code true}, external access is allowed.
     * @return a {@link SchemaFactory} for W3C XML Schema
     */
    public static SchemaFactory newW3cXmlSchemaFactory(final boolean external) {
        final SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
        if (!external) {
            disableExternalResources(schemaFactory);

### Confira { #check-it }

Abra o seu navegador em <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

Você verá essa resposta em JSON:

```JSON
{"message": "Hello World"}
```

### Documentação Interativa de APIs { #interactive-api-docs }

Agora vá para <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

### Compruébalo { #check-it }

Abre tu navegador en <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>.

Verás el response JSON como:

```JSON
{"message": "Hello World"}
```

### Documentación interactiva de la API { #interactive-api-docs }

Ahora ve a <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

///

## 추가 정보

다음 옵션에 대한 자세한 내용을 보려면 Starlette의 문서를 확인하세요:

* <a href="https://www.starlette.dev/websockets/" class="external-link" target="_blank">`WebSocket` 클래스</a>.