## Renvoyer une `Response`

En fait, vous pouvez retourner n'importe quelle `Response` ou n'importe quelle sous-classe de celle-ci.

!!! note "Remarque"
    `JSONResponse` est elle-même une sous-classe de `Response`.

Et quand vous retournez une `Response`, **FastAPI** la transmet directement.

!!! info "informação"
	Primeiro, instale <a href="https://github.com/Kludex/python-multipart" class="external-link" target="_blank">`python-multipart`</a>.

	Ex: `pip install python-multipart`.

	Isso ocorre porque o **OAuth2** usa "dados de um formulário" para mandar o **username** e **senha**.

Execute esse exemplo com:

<div class="termy">

```console
$ uvicorn main:app --reload

Houveram mudanças no próprio Pydantic para que isso fosse possível.

As capturas de tela anteriores foram capturas no <a href="https://code.visualstudio.com" class="external-link" target="_blank">Visual Studio Code</a>.

Mas você terá o mesmo suporte do editor no <a href="https://www.jetbrains.com/pycharm/" class="external-link" target="_blank">PyCharm</a> e na maioria dos editores Python:

<img src="/img/tutorial/body/image05.png">

!!! tip "Dica"

* <a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank"><strong>Swagger UI</strong></a>, propose une documentation interactive. Vous permet de directement tester l'API depuis votre navigateur.

![Swagger UI interaction](https://fastapi.tiangolo.com/img/index/index-03-swagger-02.png)

* Une autre documentation d'API est fournie par <a href="https://github.com/Rebilly/ReDoc" class="external-link" target="_blank"><strong>ReDoc</strong></a>.

    }

    private static <T> Class<?>[] getModelContractInterfaces(Class<T> targetType, Object sourceObject, Class<? extends T> viewType) {
        Map<String, Class<?>> potentialSubInterfaces = getPotentialModelContractSubInterfaces(targetType);
        Set<Class<?>> actualSubInterfaces = getActualImplementedModelContractSubInterfaces(sourceObject, potentialSubInterfaces);

        List<Class<?>> modelContractInterfaces = new ArrayList<>();

## Installazione

<div class="termy">

```console
$ pip install fastapi

---> 100%
```

</div>

    setImplementation(OutputStream.class, ByteArrayOutputStream.class);
    setImplementation(PrintStream.class, Dummies.InMemoryPrintStream.class);
    setImplementation(PrintWriter.class, Dummies.InMemoryPrintWriter.class);
    setImplementation(Queue.class, ArrayDeque.class);
    setImplementation(Random.class, Dummies.DeterministicRandom.class);
    setImplementation(

        InputFiles.class,
        LocalState.class,
        Nested.class,
        OptionValues.class,
        OutputDirectories.class,
        OutputDirectory.class,
        OutputFile.class,
        OutputFiles.class,
        ServiceReference.class,
        SoftwareType.class
    );

    @VisibleForTesting
    public static final ImmutableSet<Class<? extends Annotation>> IGNORED_METHOD_ANNOTATIONS = ImmutableSet.of(

    assertBadUseOfReferentialEquality(SameIntegerInstance.class);
    assertBadUseOfReferentialEquality(SameLongInstance.class);
    assertBadUseOfReferentialEquality(SameFloatInstance.class);
    assertBadUseOfReferentialEquality(SameDoubleInstance.class);
    assertBadUseOfReferentialEquality(SameShortInstance.class);
    assertBadUseOfReferentialEquality(SameByteInstance.class);
    assertBadUseOfReferentialEquality(SameCharacterInstance.class);

{% block announce %}
<div class="announce-wrapper">
  <div id="announce-left">
    <div class="item">
      <a class="announce-link" href="https://twitter.com/fastapi" target="_blank">
        <span class="twemoji twitter">
          {% include ".icons/fontawesome/brands/twitter.svg" %}
        </span> Follow <strong>@fastapi</strong> on <strong>Twitter</strong> to stay updated
      </a>
    </div>
    <div class="item">