version="0.0.1",
    terms_of_service="http://example.com/terms/",
    contact={
        "name": "Deadpoolio the Amazing",
        "url": "http://x-force.example.com/contact/",
        "email": "dp@x-force.example.com",
    },
    license_info={
        "name": "Apache 2.0",
        "identifier": "MIT",
    },
)


@app.get("/items/")
async def read_items():

            "termsOfService": "http://example.com/terms/",
            "contact": {
                "name": "Deadpoolio the Amazing",
                "url": "http://x-force.example.com/contact/",
                "email": "dp@x-force.example.com",
            },
            "license": {
                "name": "Apache 2.0",
                "url": "https://www.apache.org/licenses/LICENSE-2.0.html",
            },

```Python hl_lines="14"
{!../../../docs_src/background_tasks/tutorial001.py!}
```

`.add_task()` erhält als Argumente:

* Eine Taskfunktion, die im Hintergrund ausgeführt wird (`write_notification`).
* Eine beliebige Folge von Argumenten, die der Reihe nach an die Taskfunktion übergeben werden sollen (`email`).
* Alle Schlüsselwort-Argumente, die an die Taskfunktion übergeben werden sollen (`message="some notification"`).

## Dependency Injection

    version="0.0.1",
    terms_of_service="http://example.com/terms/",
    contact={
        "name": "Deadpoolio the Amazing",
        "url": "http://x-force.example.com/contact/",
        "email": "dp@x-force.example.com",
    },
    license_info={
        "name": "Apache 2.0",
        "url": "https://www.apache.org/licenses/LICENSE-2.0.html",
    },
)


@app.get("/items/")

    yaml_data = """
        name: Deadpoolio
        tags:
        - x-force
        - x-men
        - x-avengers
        """
    response = client.post("/items/", content=yaml_data)
    assert response.status_code == 200, response.text
    assert response.json() == {
        "name": "Deadpoolio",
        "tags": ["x-force", "x-men", "x-avengers"],
    }


@needs_pydanticv1

    yaml_data = """
        name: Deadpoolio
        tags:
        - x-force
        - x-men
        - x-avengers
        """
    response = client.post("/items/", content=yaml_data)
    assert response.status_code == 200, response.text
    assert response.json() == {
        "name": "Deadpoolio",
        "tags": ["x-force", "x-men", "x-avengers"],
    }


@needs_pydanticv2

            "termsOfService": "http://example.com/terms/",
            "contact": {
                "name": "Deadpoolio the Amazing",
                "url": "http://x-force.example.com/contact/",
                "email": "dp@x-force.example.com",
            },
            "license": {
                "name": "Apache 2.0",
                "identifier": "MIT",
            },
            "version": "0.0.1",
        },

!!! note "Détails techniques"
    Vous pouvez également utiliser `from starlette.responses import JSONResponse`.

    Pour plus de commodités, **FastAPI** fournit les objets `starlette.responses` sous forme d'un alias accessible par `fastapi.responses`. Mais la plupart des réponses disponibles proviennent directement de Starlette. Il en est de même avec l'objet `statut`.

## Documents OpenAPI et API