Also, the best approach was to use already existing standards.

So, before even starting to code **FastAPI**, I spent several months studying the specs for OpenAPI, JSON Schema, OAuth2, etc. Understanding their relationship, overlap, and differences.

## Design { #design }

Then I spent some time designing the developer "API" I wanted to have as a user (as a developer using FastAPI).

**FastAPI** сделает автоматическое преобразование из запроса, так что параметр `item` получит своё конкретное содержимое, и то же самое происходит с пользователем `user`.

Произойдёт проверка составных данных, и создание документации в схеме OpenAPI и автоматических документах.

## Отдельные значения в теле запроса { #singular-values-in-body }

Também, a melhor abordagem era usar padrões já existentes.

Então, antes mesmo de começar a codificar o **FastAPI**, eu investi vários meses estudando as especificações do OpenAPI, JSON Schema, OAuth2 etc. Entendendo suas relações, sobreposições e diferenças.

## Design { #design }

Wenn Sie eine `Response` direkt zurücksenden, werden deren Daten weder validiert, konvertiert (serialisiert), noch automatisch dokumentiert.

Sie können sie aber trotzdem wie unter [Zusätzliche Responses in OpenAPI](additional-responses.md){.internal-link target=_blank} beschrieben dokumentieren.

## Notas { #notes }

Cuando devuelves una `Response` directamente, sus datos no son validados, convertidos (serializados), ni documentados automáticamente.

Pero aún puedes documentarlo como se describe en [Additional Responses in OpenAPI](additional-responses.md){.internal-link target=_blank}.

* **简单**：设计的易于使用和学习，阅读文档的时间更短。
* **简短**：使代码重复最小化。通过不同的参数声明实现丰富功能。bug 更少。
* **健壮**：生产可用级别的代码。还有自动生成的交互式文档。
* **标准化**：基于（并完全兼容）API 的相关开放标准：<a href="https://github.com/OAI/OpenAPI-Specification" class="external-link" target="_blank">OpenAPI</a> (以前被称为 Swagger) 和 <a href="https://json-schema.org/" class="external-link" target="_blank">JSON Schema</a>。

<small>* 根据对某个构建线上应用的内部开发团队所进行的测试估算得出。</small>

## Sponsors

## Notes { #notes }

When you return a `Response` directly its data is not validated, converted (serialized), or documented automatically.

But you can still document it as described in [Additional Responses in OpenAPI](additional-responses.md){.internal-link target=_blank}.

Lorsque vous renvoyez une `Response` directement, ses données ne sont pas validées, converties (sérialisées), ni documentées automatiquement.

Mais vous pouvez toujours les documenter comme décrit dans [Additional Responses in OpenAPI](additional-responses.md){.internal-link target=_blank}.

    WeakKeyDictionary()
)


def is_body_allowed_for_status_code(status_code: Union[int, str, None]) -> bool:
    if status_code is None:
        return True
    # Ref: https://github.com/OAI/OpenAPI-Specification/blob/main/versions/3.1.0.md#patterned-fields-1
    if status_code in {
        "default",
        "1XX",
        "2XX",
        "3XX",
        "4XX",
        "5XX",
    }:
        return True

    """
    app = create_app()
    client = TestClient(app)
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "openapi": "3.1.0",
        "info": {"title": "FastAPI", "version": "0.1.0"},
        "paths": {
            "/schema_extra/": {
                "post": {