Die einfachste FastAPI-Datei könnte wie folgt aussehen:

{* ../../docs_src/first_steps/tutorial001_py39.py *}

Kopieren Sie das in eine Datei `main.py`.

Starten Sie den Live-Server:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀

이를 위해 `__call__` 메서드를 선언합니다:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[12] *}

이 경우, **FastAPI**는 추가 매개변수와 하위 의존성을 확인하기 위해 `__call__`을 사용하게 되며,
나중에 *경로 연산 함수*에서 매개변수에 값을 전달할 때 이를 호출하게 됩니다.

## 인스턴스 매개변수화하기

이제 `__init__`을 사용하여 의존성을 "매개변수화"할 수 있는 인스턴스의 매개변수를 선언할 수 있습니다:

{* ../../docs_src/dependencies/tutorial011_an_py39.py hl[9] *}

이 경우, **FastAPI**는 `__init__`에 전혀 관여하지 않으며, 우리는 이 메서드를 코드에서 직접 사용하게 됩니다.

{* ../../docs_src/background_tasks/tutorial001.py hl[6:9] *}

## Ajouter une tâche d'arrière-plan

Dans votre *fonction de chemin*, passez votre fonction de tâche à l'objet de type `BackgroundTasks` (`background_tasks` ici) grâce à la méthode `.add_task()` :


{* ../../docs_src/background_tasks/tutorial001.py hl[14] *}

`.add_task()` reçoit comme arguments :

All the code blocks can be copied and used directly (they are actually tested Python files).

To run any of the examples, copy the code to a file `main.py`, and start `fastapi dev` with:

<div class="termy">

```console
$ <font color="#4E9A06">fastapi</font> dev <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting development server 🚀

{* ../../docs_src/metadata/tutorial004.py hl[3:16,18] *}

説明文 (description) の中で Markdown を使用できることに注意してください。たとえば、「login」は太字 (**login**) で表示され、「fancy」は斜体 (_fancy_) で表示されます。

/// tip | 豆知識

使用するすべてのタグにメタデータを追加する必要はありません。

///

### 自作タグの使用

`tags` パラメーターを使用して、それぞれの *path operations* (および `APIRouter`) を異なるタグに割り当てます:

{* ../../docs_src/metadata/tutorial004.py hl[21,26] *}

/// info | 情報

```console
$ <font color="#4E9A06">fastapi</font> run <u style="text-decoration-style:solid">main.py</u>

  <span style="background-color:#009485"><font color="#D3D7CF"> FastAPI </font></span>  Starting production server 🚀

             Searching for package file structure from directories
             with <font color="#3465A4">__init__.py</font> files

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[3] *}

## Declarar parámetros de `Cookie` { #declare-cookie-parameters }

Luego declara los parámetros de cookie usando la misma estructura que con `Path` y `Query`.

Puedes definir el valor por defecto así como toda la validación extra o los parámetros de anotación:

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

/// note | Detalles Técnicos

{* ../../docs_src/cookie_params/tutorial001_an_py310.py hl[3] *}

## Declare `Cookie` parameters { #declare-cookie-parameters }

Then declare the cookie parameters using the same structure as with `Path` and `Query`.

You can define the default value as well as all the extra validation or annotation parameters:

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

/// note | Technical Details

Aqui estamos incluindo-o na mensagem apenas para fins de demonstração.

{* ../../docs_src/behind_a_proxy/tutorial001_py39.py hl[8] *}

Então, se você iniciar o Uvicorn com:

<div class="termy">

```console
$ fastapi run main.py --forwarded-allow-ips="*" --root-path /api/v1

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

Inclui estas configurações padrão:

{* ../../fastapi/openapi/docs.py ln[9:24] hl[18:24] *}

Você pode substituir qualquer um deles definindo um valor diferente no argumento `swagger_ui_parameters`.

Por exemplo, para desabilitar `deepLinking` você pode passar essas configurações para `swagger_ui_parameters`:

{* ../../docs_src/configure_swagger_ui/tutorial003_py39.py hl[3] *}