assert response.status_code == 200, response.text
    assert response.json() == {"message": "No file sent"}


@needs_py39
def test_post_uploadfile_no_body(client: TestClient):
    response = client.post("/uploadfile/")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "No upload file sent"}


@needs_py39
def test_post_file(tmp_path: Path, client: TestClient):

    E.g. `pip install python-multipart`.

    This is because uploaded files are sent as "form data".

## Import `File`

Import `File` and `UploadFile` from `fastapi`:

=== "Python 3.9+"

    ```Python hl_lines="3"
    {!> ../../../docs_src/request_files/tutorial001_an_py39.py!}
    ```

dụng** đầu tiên (những gì bạn đang đọc).

Nó được thiết kế do đó bạn có thể xây dựng một ứng dụng hoàn chỉnh chỉ với **Hướng dẫn sử dụng**, và sau đó mở rộng nó theo các cách khác nhau, phụ thuộc vào những gì bạn cần, sử dụng một vài ý tưởng bổ sung từ **Hướng dẫn sử dụng nâng cao**....

### The callback path expression

The callback *path* can have an <a href="https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md#key-expression" class="external-link" target="_blank">OpenAPI 3 expression</a> that can contain parts of the original request sent to *your API*.

In this case, it's the `str`:

```Python

Il est tout de même possible d'utiliser `BackgroundTask` seul dans **FastAPI**, mais dans ce cas il faut créer l'objet dans le code et renvoyer une `Response` Starlette l'incluant.

Plus de détails sont disponibles dans <a href="https://www.starlette.io/background/" class="external-link" target="_blank">la documentation officielle de Starlette sur les tâches d'arrière-plan</a> (via leurs classes `BackgroundTasks`et `BackgroundTask`).

participant dep as Dep with yield
participant operation as Path Operation
participant tasks as Background tasks

    Note over client,tasks: Can raise exception for dependency, handled after response is sent
    Note over client,operation: Can raise HTTPException and can change the response
    client ->> dep: Start request
    Note over dep: Run code up to yield
    opt raise
        dep -->> handler: Raise HTTPException

De nombreux tutoriels comportent des blocs de code.

Dans la plupart des cas, ces blocs de code sont de véritables applications complètes qui peuvent être exécutées telles quelles.

En fait, ces blocs de code ne sont pas écrits à l'intérieur du Markdown, ce sont des fichiers Python dans le répertoire `./docs_src/`.

Et ces fichiers Python sont inclus/injectés dans la documentation lors de la génération du site.

### Documentation pour les tests

@app.post("/send-notification/{email}")
async def send_notification(email: str, background_tasks: BackgroundTasks):
    background_tasks.add_task(write_notification, email, message="some notification")

!!! warning "Attention"
    Si vous n'êtes pas un "expert" en OpenAPI, vous n'en avez probablement pas besoin.

        os.remove(log)  # pragma: no cover
    response = client.post("/send-notification/******@****.***?q=some-query")
    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Message sent"}
    with open("./log.txt") as f: