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    FastAPI フレームワーク、高パフォーマンス、学びやすい、素早くコーディングできる、本番運用に対応
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("Commercial Contributor") hereby agrees to defend and indemnify every
other Contributor ("Indemnified Contributor") against any losses,
damages and costs (collectively "Losses") arising from claims, lawsuits
and other legal actions brought by a third party against the Indemnified
Contributor to the extent caused by the acts or omissions of such
Commercial Contributor in connection with its distribution of the Program

## Une application avec des callbacks { #an-app-with-callbacks }

Voyons tout cela avec un exemple.

Imaginez que vous développiez une application qui permet de créer des factures.

Ces factures auront un `id`, un `title` (facultatif), un `customer` et un `total`.

L’utilisateur de votre API (une personne développeuse externe) créera une facture dans votre API avec une requête POST.

Ensuite votre API va (imaginons) :

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    FastAPI 프레임워크, 고성능, 간편한 학습, 빠른 코드 작성, 준비된 프로덕션
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         */
        public int decrement() {
            return count.decrementAndGet();
        }
    }

    /**
     * Enumeration of predefined statistics actions that can be recorded
     * during crawler operations. Each action represents a specific event
     * or milestone in the crawling process.
     */
    public enum StatsAction {

Then you could add permissions about that entity, like "drive" (for the car) or "edit" (for the blog).

And then, you could give that JWT token to a user (or bot), and they could use it to perform those actions (drive the car, or edit the blog post) without even needing to have an account, just with the JWT token your API generated for that.

Using these ideas, JWT can be used for way more sophisticated scenarios.

The MinIO server requires an available KMS to en/decrypt SSE-S3 encrypted objects. Therefore it is possible to erase or lock some or all encrypted objects. For example in case of a detected attack or other emergency situations the following actions can be taken:

OpenAPI에서는 이를 `anyOf`로 정의합니다.

이를 위해 표준 Python 타입 힌트인 [`typing.Union`](https://docs.python.org/3/library/typing.html#typing.Union)을 사용할 수 있습니다:

/// note

[`Union`](https://docs.pydantic.dev/latest/concepts/types/#unions)을 정의할 때는 더 구체적인 타입을 먼저 포함하고, 덜 구체적인 타입을 그 뒤에 나열해야 합니다. 아래 예제에서는 `Union[PlaneItem, CarItem]`에서 더 구체적인 `PlaneItem`이 `CarItem`보다 앞에 위치합니다.

///

{* ../../docs_src/extra_models/tutorial003_py310.py hl[1,14:15,18:20,33] *}

///

### Understand that Code { #understand-that-code }

The important point is just using **`AfterValidator` with a function inside `Annotated`**. Feel free to skip this part. 🤸

---

But if you're curious about this specific code example and you're still entertained, here are some extra details.

#### String with `value.startswith()` { #string-with-value-startswith }

every other Contributor ("Indemnified Contributor") against any losses, damages
and costs (collectively "Losses") arising from claims, lawsuits and other
legal actions brought by a third party against the Indemnified Contributor
to the extent caused by the acts or omissions of such Commercial Contributor
in connection with its distribution of the Program in a commercial product