/// note | Detalhes Técnicos

`Security` é na verdade uma subclasse de `Depends`, e ele possui apenas um parâmetro extra que veremos depois.

Porém ao utilizar `Security` no lugar de `Depends`, o **FastAPI** saberá que ele pode declarar escopos de segurança, utilizá-los internamente, e documentar a API com o OpenAPI.

/// info | Teknik Detaylar

`Security` aslında `Depends`'in bir alt sınıfıdır ve sadece birazdan göreceğimiz bir ek parametreye sahiptir.

Ancak `Depends` yerine `Security` kullanınca **FastAPI**, security scope'larının tanımlanabileceğini bilir, bunları içeride kullanır ve API'yi OpenAPI ile dokümante eder.

from __future__ import annotations

from typing import Annotated

from fastapi import Depends, FastAPI, Request
from fastapi.testclient import TestClient

from .utils import needs_py310


class Dep:
    def __call__(self, request: Request):
        return "test"


@needs_py310
def test_stringified_annotations():
    app = FastAPI()

    client = TestClient(app)

    @app.get("/test/")

      return div;
    }

    /*
     * Normal Java division rounds towards 0, consistently with RoundingMode.DOWN. We just have to
     * deal with the cases where rounding towards 0 is wrong, which typically depends on the sign of
     * p / q.
     *
     * signum is 1 if p and q are both nonnegative or both negative, and -1 otherwise.
     */
    int signum = 1 | ((p ^ q) >> (Integer.SIZE - 1));
    boolean increment;

        }

        @Test
        @DisplayName("Should calculate padding")
        void testPad8() {
            testMessage.encode(new byte[1024], 0);
            // After header is written, padding depends on position
            int headerStart = testMessage.getHeaderStart();
            assertEquals(0, headerStart); // Should start at 0
        }
    }

    @Nested
    @DisplayName("Encode/Decode Tests")

{* ../../docs_src/security/tutorial002_an_py310.py hl[19:22,26:27] *}

## Injetar o usuário atual { #inject-the-current-user }

Então agora nós podemos usar o mesmo `Depends` com nosso `get_current_user` na *operação de rota*:

{* ../../docs_src/security/tutorial002_an_py310.py hl[31] *}

Observe que nós declaramos o tipo de `current_user` como o modelo Pydantic `User`.

`Security` ist tatsächlich eine Unterklasse von `Depends` und hat nur noch einen zusätzlichen Parameter, den wir später kennenlernen werden.

Durch die Verwendung von `Security` anstelle von `Depends` weiß **FastAPI** jedoch, dass es Sicherheits-Scopes deklarieren, intern verwenden und die API mit OpenAPI dokumentieren kann.

### `yield` ve `scope` ile dependency'ler { #dependencies-with-yield-and-scope }

0.121.0 sürümünde FastAPI, `Depends(scope="function")` desteğini ekledi.

`Depends(scope="function")` kullanıldığında, `yield` sonrasındaki çıkış kodu, *path operation function* biter bitmez, response client'a geri gönderilmeden önce çalıştırılır.

В версии 0.121.0 FastAPI добавил поддержку `Depends(scope="function")` для зависимостей с `yield`.

При использовании `Depends(scope="function")` код после `yield` выполняется сразу после завершения *функции-обработчика пути*, до отправки ответа клиенту.

А при использовании `Depends(scope="request")` (значение по умолчанию) код после `yield` выполняется после отправки ответа.

//// tab | Python 3.10+

```Python hl_lines="1"
async def needy_dependency(fresh_value: Annotated[str, Depends(get_value, use_cache=False)]):
    return {"fresh_value": fresh_value}
```

////

//// tab | Python 3.10+ без Annotated

/// tip | Порада