En nuestro ejemplo de código arriba, no lo usamos directamente, pero se lo pasamos a FastAPI para que lo use.

El parámetro `lifespan` de la app de `FastAPI` toma un **async context manager**, por lo que podemos pasar nuestro nuevo `lifespan` async context manager a él.

{* ../../docs_src/events/tutorial003_py39.py hl[22] *}

    * This will be done by sending a POST request (from *your API*) to some *external API* provided by that external developer (this is the "callback").

## The normal **FastAPI** app { #the-normal-fastapi-app }

Let's first see how the normal API app would look like before adding the callback.

이는 **FastAPI**가 다음과 유사한 본문을 기대한다는 것을 의미합니다:

```JSON
{
    "name": "Foo",
    "description": "The pretender",
    "price": 42.0,
    "tax": 3.2,
    "tags": ["rock", "metal", "bar"],
    "image": {
        "url": "http://example.com/baz.jpg",
        "name": "The Foo live"
    }
}
```

다시 한번, **FastAPI**를 사용하여 해당 선언을 함으로써 얻는 것은:

* 중첩 모델도 편집기 지원(자동완성 등)

    * Isso será feito enviando um request POST (de *sua API*) para alguma *API externa* fornecida por esse desenvolvedor externo (este é o "callback").

## O aplicativo **FastAPI** normal { #the-normal-fastapi-app }

Vamos primeiro ver como o aplicativo da API normal se pareceria antes de adicionar o callback.

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[9] *}

/// note | Teknik Detaylar

`Cookie` sınıfı `Path` ve `Query` sınıflarının kardeşidir. Diğerleri gibi `Param` sınıfını miras alan bir sınıftır.

Ancak `fastapi`'dan projenize dahil ettiğiniz `Query`, `Path`, `Cookie` ve diğerleri aslında özel sınıflar döndüren birer fonksiyondur.

///

/// info | Bilgi

# 使用指南 - 範例集

在這裡，你將會看到**不同主題**的範例或「如何使用」的指南。

大多數這些想法都是**獨立**的，在大多數情況下，你只需要研究那些直接適用於**你的專案**的東西。

如果有些東西看起來很有趣且對你的專案很有用的話再去讀它，否則你可能可以跳過它們。

/// tip

如果你想要以結構化的方式**學習 FastAPI**（推薦），請前往[教學 - 使用者指南](../tutorial/index.md){.internal-link target=_blank}逐章閱讀。

    page.screenshot(path="docs/en/docs/img/tutorial/sql-databases/image01.png")

    # ---------------------
    context.close()
    browser.close()


process = subprocess.Popen(
    ["fastapi", "run", "docs_src/sql_databases/tutorial001.py"],
)
try:
    for _ in range(3):
        try:
            response = httpx.get("http://localhost:8000/docs")
        except httpx.ConnectError:
            time.sleep(1)

import importlib
from types import ModuleType

import pytest
from fastapi.testclient import TestClient
from pytest import MonkeyPatch


@pytest.fixture(
    name="mod_path",
    params=[
        pytest.param("app03_py39"),
        pytest.param("app03_an_py39"),
    ],
)
def get_mod_path(request: pytest.FixtureRequest):
    mod_path = f"docs_src.settings.{request.param}"
    return mod_path

import importlib

import pytest
from fastapi.testclient import TestClient

from ...utils import needs_py310


@pytest.fixture(
    name="client",
    params=[
        pytest.param("tutorial005_py39"),
        pytest.param("tutorial005_py310", marks=needs_py310),
        pytest.param("tutorial005_an_py39"),
        pytest.param("tutorial005_an_py310", marks=needs_py310),
    ],
)
def get_client(request: pytest.FixtureRequest):

from fastapi.testclient import TestClient

from .main import app

client = TestClient(app)


def test_read_item():
    response = client.get("/items/foo", headers={"X-Token": "coneofsilence"})
    assert response.status_code == 200
    assert response.json() == {
        "id": "foo",
        "title": "Foo",
        "description": "There goes my hero",
    }


def test_read_item_bad_token():