ただし、ブラウザのクライアントに表示させたいカスタムヘッダーがある場合は、<a href="https://www.starlette.io/middleware/#corsmiddleware" class="external-link" target="_blank">StarletteのCORSドキュメント</a>に記載されているパラメータ `expose_headers` を使用して、それらをCORS設定に追加する必要があります ([CORS (オリジン間リソース共有)](cors.md){.internal-link target=_blank})

///

/// note | "技術詳細"

`from starlette.requests import Request` を使用することもできます。

* Um programa específico enquanto está **em execução** no sistema operacional.
    * Isso não se refere ao arquivo, nem ao código, refere-se **especificamente** à coisa que está sendo **executada** e gerenciada pelo sistema operacional.
* Qualquer programa, qualquer código, **só pode fazer coisas** quando está sendo **executado**. Então, quando há um **processo em execução**.

from fastapi.testclient import TestClient

from docs_src.cors.tutorial001 import app


def test_cors():
    client = TestClient(app)
    # Test pre-flight response
    headers = {
        "Origin": "https://localhost.tiangolo.com",
        "Access-Control-Request-Method": "GET",
        "Access-Control-Request-Headers": "X-Example",
    }
    response = client.options("/", headers=headers)
    assert response.status_code == 200, response.text

///

/// توجه | "جزئیات فنی"

شما همچنین می‌توانید از `from starlette.requests import Request` استفاده کنید.

Im Haupttutorial haben Sie gelesen, wie Sie Ihrer Anwendung [benutzerdefinierte Middleware](../tutorial/middleware.md){.internal-link target=_blank} hinzufügen können.

Und dann auch, wie man [CORS mittels der `CORSMiddleware`](../tutorial/cors.md){.internal-link target=_blank} handhabt.

In diesem Abschnitt werden wir sehen, wie man andere Middlewares verwendet.

## ASGI-Middleware hinzufügen

<!DOCTYPE components PUBLIC "-//DBFLUTE//DTD LastaDi 1.0//EN"
	"http://dbflute.org/meta/lastadi10.dtd">
<components>
	<component name="corsHandlerFactory" class="org.codelibs.fess.cors.CorsHandlerFactory">
	</component>

	<component name="defaultCorsHandler" class="org.codelibs.fess.cors.DefaultCorsHandler">
	</component>

# Advanced Middleware

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

But if you have custom headers that you want a client in a browser to be able to see, you need to add them to your CORS configurations ([CORS (Cross-Origin Resource Sharing)](cors.md){.internal-link target=_blank}) using the parameter `expose_headers` documented in <a href="https://www.starlette.io/middleware/#corsmiddleware" class="external-link" target="_blank">Starlette's CORS docs</a>.

///

/// note | "Technical Details"

			Queries("cors", "")
		// PutBucketCors - this is a dummy call.
		router.Methods(http.MethodPut).
			HandlerFunc(s3APIMiddleware(api.PutBucketCorsHandler)).
			Queries("cors", "")
		// DeleteBucketCors - this is a dummy call.
		router.Methods(http.MethodDelete).
			HandlerFunc(s3APIMiddleware(api.DeleteBucketCorsHandler)).
			Queries("cors", "")
		// GetBucketWebsiteHandler - this is a dummy call.

y deseas que un cliente pueda verlos en el navegador, es necesario que los añadas a tus configuraciones de CORS (puedes leer más en [CORS (Cross-Origin Resource Sharing)](../tutorial/cors.md){.internal-link target=_blank}), usando el parámetro `expose_headers` documentado en <a href="https://www.starlette.io/middleware/#corsmiddleware" class="external-link" target="_blank">Starlette's CORS docs</a>....