ContentOutputStream cos = new ContentOutputStream(10, Curl.tmpDir);
        cos.write(new byte[] { 0, 1, 2 });
        assertTrue(cos.isInMemory());
        cos.write(new byte[] { 3, 4 });
        assertTrue(cos.isInMemory());
        cos.write(new byte[] { 5 });
        assertTrue(cos.isInMemory());
        assertFalse(cos.done);
        cos.close();
    }

    @Test

пользовательские заголовки, которые вы хотите показывать клиенту в браузере, вам нужно добавить их в настройки CORS (подробнее см. в [CORS (Cross-Origin Resource Sharing)](../tutorial/cors.md){.internal-link target=_blank}), используя параметр `expose_headers`, описанный в <a href="https://www.starlette.dev/middleware/#corsmiddleware" class="external-link" target="_blank">документации Starlette по CORS</a>....

En el tutorial principal leíste cómo agregar [Middleware Personalizado](../tutorial/middleware.md){.internal-link target=_blank} a tu aplicación.

Y luego también leíste cómo manejar [CORS con el `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

En esta sección veremos cómo usar otros middlewares.

## Agregando middlewares ASGI { #adding-asgi-middlewares }

///

/// note | Технические детали

---

## **Typer**, el FastAPI de las CLIs { #typer-the-fastapi-of-clis }

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

///

## 自定义头部

请注意，可以使用'X-'前缀添加自定义专有头部。

그러나 만약 클라이언트의 브라우저에서 볼 수 있는 사용자 정의 헤더를 가지고 있다면, 그것들을 CORS 설정([CORS (Cross-Origin Resource Sharing)](cors.md){.internal-link target=_blank})에 <a href="https://www.starlette.dev/middleware/#corsmiddleware" class="external-link" target="_blank">Starlette CORS 문서</a>에 명시된 `expose_headers` 매개변수를 이용하여 헤더들을 추가하여야합니다.

///

/// note | 기술적 세부사항

///

/// note | Technische Details

Read more about them in the [FastAPI docs for Middleware](https://fastapi.tiangolo.com/advanced/middleware/).

::: fastapi.middleware.cors.CORSMiddleware

It can be imported from `fastapi`:

```python
from fastapi.middleware.cors import CORSMiddleware
```

::: fastapi.middleware.gzip.GZipMiddleware

It can be imported from `fastapi`:

```python

In the main tutorial you read how to add [Custom Middleware](../tutorial/middleware.md){.internal-link target=_blank} to your application.

And then you also read how to handle [CORS with the `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank}.

In this section we'll see how to use other middlewares.

## Adding ASGI middlewares { #adding-asgi-middlewares }