## Caso de Uso

Empecemos con un ejemplo de **caso de uso** y luego veamos cómo resolverlo con esto.

Imaginemos que tienes algunos **modelos de machine learning** que quieres usar para manejar requests. 🤖

Los mismos modelos son compartidos entre requests, por lo que no es un modelo por request, o uno por usuario o algo similar.

모든 검증은 견고하면서 잘 확립된 **Pydantic**에 의해 처리됩니다.

### 보안과 인증

보안과 인증이 통합되어 있습니다. 데이터베이스나 데이터 모델과의 타협없이 사용할 수 있습니다.

다음을 포함하는, 모든 보안 스키마가 OpenAPI에 정의되어 있습니다.

* HTTP Basic.
* **OAuth2** (**JWT tokens** 또한 포함). [OAuth2 with JWT](tutorial/security/oauth2-jwt.md){.internal-link target=\_blank}에 있는 자습서를 확인해 보세요.
* 다음에 들어 있는 API 키:
    * 헤더.
    * 매개변수.
    * 쿠키 및 그 외.

soldiers did.  After these came the royal children; there were
ten of them, and the little dears came jumping merrily along hand
in hand, in couples:  they were all ornamented with hearts.  Next
came the guests, mostly Kings and Queens, and among them Alice
recognised the White Rabbit:  it was talking in a hurried nervous
manner, smiling at everything that was said, and went by without
noticing her.  Then followed the Knave of Hearts, carrying the

Segurança e autenticação integradas. Sem nenhum compromisso com bancos de dados ou modelos de dados.

Todos os esquemas de seguranças definidos no OpenAPI, incluindo:

* HTTP Basic.
* **OAuth2** (também com **tokens JWT**). Confira o tutorial em [OAuth2 com JWT](tutorial/security/oauth2-jwt.md){.internal-link target=_blank}.
* Chaves de API em:
    * Headers.
    * parâmetros da Query.
    * Cookies etc.

{* ../../docs_src/dependencies/tutorial007.py hl[3,5] *}

## Sub-dependencies with `yield` { #sub-dependencies-with-yield }

You can have sub-dependencies and "trees" of sub-dependencies of any size and shape, and any or all of them can use `yield`.

**FastAPI** will make sure that the "exit code" in each dependency with `yield` is run in the correct order.

Beveiliging en authenticatie is geïntegreerd. Zonder compromissen te doen naar databases of datamodellen.

Alle beveiligingsschema's gedefinieerd in OpenAPI, inclusief:

* HTTP Basic.
* **OAuth2** (ook met **JWT tokens**). Bekijk de tutorial over [OAuth2 with JWT](tutorial/security/oauth2-jwt.md){.internal-link target=_blank}.
* API keys in:
    * Headers.
    * Query parameters.
    * Cookies, enz.

        } catch (final Exception e) {
            throw new SsoLoginException("Failed to get a token.", e);
        }
    }

    /**
     * Attempts to refresh tokens silently using the MSAL4J silent authentication flow.
     * @param user The Azure AD user whose tokens need to be refreshed.
     * @return The new authentication result, or null if silent refresh failed.
     */

        }
    }

    /**
     * Attempts to obtain login credentials using SPNEGO authentication.
     *
     * This method processes the HTTP request to extract and validate SPNEGO
     * authentication tokens. It handles the SPNEGO handshake process and
     * extracts the user principal from successful authentication.
     *
     * @return The login credential containing the authenticated username,

* Sécurité et authentification, y compris la prise en charge de **OAuth2** avec les **<abbr title="en anglais : JWT tokens">jetons <abbr title="JSON Web Tokens">JWT</abbr></abbr>** et l'authentification **HTTP Basic**.

* Một hệ thống **<abbr title="cũng được biết đến như components, resources, providers, services, injectables">Dependency Injection</abbr> vô cùng mạnh mẽ và dễ dàng sử dụng.
* Bảo mật và xác thực, hỗ trợ **OAuth2**(với **JWT tokens**) và **HTTP Basic**.
* Những kĩ thuật nâng cao hơn (nhưng tương đối dễ) để định nghĩa **JSON models lồng nhau** (cảm ơn Pydantic).