<div class="screenshot">
<img src="/img/tutorial/separate-openapi-schemas/image02.png">
</div>

Isso significa que ele **sempre terá um valor**, só que às vezes o valor pode ser `None` (ou `null` em termos de JSON).

    response = client.get("/items/foo")
    assert response.status_code == 404, response.text
    assert response.json() == {"detail": "Item not found, there's only a plumbus here"}


def test_get(client: TestClient):
    response = client.get("/items/plumbus")
    assert response.status_code == 200, response.text
    assert response.json() == "plumbus"


def test_internal_error(client: TestClient):

Standardmäßig konvertiert **FastAPI** diesen Rückgabewert automatisch nach JSON, mithilfe des `jsonable_encoder`, der in [JSON-kompatibler Encoder](../tutorial/encoder.md){.internal-link target=_blank} erläutert wird.

Dann würde es hinter den Kulissen diese JSON-kompatiblen Daten (z. B. ein `dict`) in eine `JSONResponse` einfügen, die zum Senden der Response an den Client verwendet würde.

Por defecto, **FastAPI** convertiría automáticamente ese valor devuelto a JSON usando el `jsonable_encoder` explicado en [Codificador Compatible JSON](../tutorial/encoder.md){.internal-link target=_blank}.

Luego, tras bastidores, pondría esos datos compatibles con JSON (por ejemplo, un `dict`) dentro de una `JSONResponse` que se usaría para enviar la respuesta al cliente.

     -config-ep http://127.0.0.1:5556/dex/.well-known/openid-configuration \
     -cscopes groups,openid,email,profile
```

```
~ mc admin policy create admin allaccess.json
```

Contents of `allaccess.json`

```json
{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Action": [
        "s3:*"
      ],
      "Resource": [
        "arn:aws:s3:::*"
      ]

 - [Git](https://github.com/codelibs/fess-ds-git)
 - [Gitbucket](https://github.com/codelibs/fess-ds-gitbucket)
 - [G Suite](https://github.com/codelibs/fess-ds-gsuite)
 - [JSON](https://github.com/codelibs/fess-ds-json)
 - [Office 365](https://github.com/codelibs/fess-ds-office365)
 - [S3](https://github.com/codelibs/fess-ds-s3)
 - [Salesforce](https://github.com/codelibs/fess-ds-salesforce)

type AuthNSuccessResponse struct {
	User               string                 `json:"user"`
	MaxValiditySeconds int                    `json:"maxValiditySeconds"`
	Claims             map[string]interface{} `json:"claims"`
}

// AuthNErrorResponse - represents an error response from the authN plugin.
type AuthNErrorResponse struct {
	Reason string `json:"reason"`
}

if diff -pruN <(./mc stat --no-list --json sitea/bucket/hosts | jq .) <(./mc stat --no-list --json siteb/bucket/hosts | jq .) | grep -q 'COMPLETED\|REPLICA'; then
	echo "verified sitea-> COMPLETED, siteb-> REPLICA"
fi

if diff -pruN <(./mc stat --no-list --json sitea/bucket/hosts | jq .) <(./mc stat --no-list --json sitec/bucket/hosts | jq .) | grep -q 'COMPLETED\|REPLICA'; then

{!../../docs_src/body_nested_models/tutorial005.py!}
```

이 문자열이 유효한 URL인지 검사하고 JSON 스키마/OpenAPI로 문서화 됩니다.

## 서브모델 리스트를 갖는 어트리뷰트

`list`, `set` 등의 서브타입으로 Pydantic 모델을 사용할 수도 있습니다:

```Python hl_lines="20"
{!../../docs_src/body_nested_models/tutorial006.py!}
```

아래와 같은 JSON 본문으로 예상(변환, 검증, 문서화 등을)합니다:

```JSON hl_lines="11"
{
    "name": "Foo",
    "description": "The pretender",

Z. B.:

* Um einen *Pfad*- oder *Query*-Parameter zu übergeben, fügen Sie ihn der URL selbst hinzu.
* Um einen JSON-Body zu übergeben, übergeben Sie ein Python-Objekt (z. B. ein `dict`) an den Parameter `json`.
* Wenn Sie *Formulardaten* anstelle von JSON senden müssen, verwenden Sie stattdessen den `data`-Parameter.
* Um *Header* zu übergeben, verwenden Sie ein `dict` im `headers`-Parameter.