トークンの有効期限を表す`timedelta`を作成します。

JWTアクセストークンを作成し、それを返します。

```Python hl_lines="115-130"
{!../../../docs_src/security/tutorial004.py!}
```

### JWTの"subject" `sub` についての技術的な詳細

JWTの仕様では、トークンのsubjectを表すキー`sub`があるとされています。

使用するかどうかは任意ですが、`sub`はユーザーの識別情報を入れるように規定されているので、ここで使用します。

JWTは、ユーザーを識別して、そのユーザーがAPI上で直接操作を実行できるようにする以外にも、他の用途で使用されることがあります。

例えば、「車」や「ブログ記事」を識別することができます。

# ✅ 🇨🇻 - 🏺, ✳, 🎏

👆 💪 🗻 🇨🇻 🈸 👆 👀 ⏮️ [🎧 🈸 - 🗻](sub-applications.md){.internal-link target=_blank}, [⛅ 🗳](behind-a-proxy.md){.internal-link target=_blank}.

👈, 👆 💪 ⚙️ `WSGIMiddleware` & ⚙️ ⚫️ 🎁 👆 🇨🇻 🈸, 🖼, 🏺, ✳, ♒️.

## ⚙️ `WSGIMiddleware`

👆 💪 🗄 `WSGIMiddleware`.

⤴️ 🎁 🇨🇻 (✅ 🏺) 📱 ⏮️ 🛠️.

& ⤴️ 🗻 👈 🔽 ➡.

```Python hl_lines="2-3  22"
{!../../../docs_src/wsgi/tutorial001.py!}
```

## ✅ ⚫️

## Unteranwendungen

### Dependências

O mesmo se aplica para as dependências. Se uma dependência tem as funções com padrão `def` ao invés de `async def`, ela é rodada no threadpool externo.

### Sub-dependências

    from docs_src.security.tutorial005_py39 import create_access_token

    access_token = create_access_token(data={"data": "foo"})
    assert access_token


@needs_py39
def test_token_no_sub(client: TestClient):
    response = client.get(
        "/users/me",
        headers={
            "Authorization": "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJkYXRhIjoiZm9vIn0.9ynBhuYb4e6aW3oJr_K_TBgwcMTDpRToQIE25L57rOE"

```

Dann wird er nicht in das OpenAPI-Schema aufgenommen.

## Mounten einer Unteranwendung

Wenn Sie gleichzeitig eine Unteranwendung mounten (wie beschrieben in [Unteranwendungen – Mounts](sub-applications.md){.internal-link target=_blank}) und einen Proxy mit `root_path` verwenden wollen, können Sie das normal tun, wie Sie es erwarten würden.

## 0.4.0

* Add `openapi_prefix`, support for reverse proxy and mounting sub-applications. See the docs at [https://fastapi.tiangolo.com/advanced/sub-applications-proxy/](https://fastapi.tiangolo.com/advanced/sub-applications-proxy/): [#26](https://github.com/tiangolo/fastapi/pull/26) by [@kabirkhan](https://github.com/kabirkhan).

```Python hl_lines="3  6-8"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### Unteranwendung

Erstellen Sie dann Ihre Unteranwendung und deren *Pfadoperationen*.

Diese Unteranwendung ist nur eine weitere Standard-FastAPI-Anwendung, aber diese wird „gemountet“:

```Python hl_lines="11  14-16"
{!../../../docs_src/sub_applications/tutorial001.py!}
```

### Die Unteranwendung mounten

# Sub-dependencies

You can create dependencies that have **sub-dependencies**.

They can be as **deep** as you need them to be.

**FastAPI** will take care of solving them.

## First dependency "dependable"

You could create a first dependency ("dependable") like:

=== "Python 3.10+"

    ```Python hl_lines="8-9"
    {!> ../../../docs_src/dependencies/tutorial005_an_py310.py!}
    ```

=== "Python 3.9+"

        return {"name": name, "description": "model-a-desc", "foo": model_c}

    client = TestClient(app)
    return client


@needs_pydanticv2
def test_filter_sub_model(client: TestClient):
    response = client.get("/model/modelA")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "name": "modelA",
        "description": "model-a-desc",