headers can be added <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers" class="external-link" target="_blank">using the 'X-' prefix</a>.

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 (read more in [CORS (Cross-Origin Resource Sharing)](../tutorial/cors.md){.internal-link target=_blank}), using the parameter `expose_headers` documented in <a href="https://www.starlette.io/middleware/#corsmiddleware"...

        <constraint name="__context__" within="" contains="" />

Cualquier función que sea válida para usar con:

* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.contextmanager" class="external-link" target="_blank">`@contextlib.contextmanager`</a> o
* <a href="https://docs.python.org/3/library/contextlib.html#contextlib.asynccontextmanager" class="external-link" target="_blank">`@contextlib.asynccontextmanager`</a>

sería válida para usar como una dependencia en **FastAPI**.

### Instalar `pydantic-settings`

Primero, asegúrate de crear tu [entorno virtual](../virtual-environments.md){.internal-link target=_blank}, actívalo y luego instala el paquete `pydantic-settings`:

<div class="termy">

```console

[*경로 작동 데코레이터*에 `dependencies` 추가하기](dependencies-in-path-operation-decorators.md){.internal-link target=_blank}와 유사한 방법으로 `FastAPI` 애플리케이션에 그것들을 추가할 수 있습니다.

그런 경우에, 애플리케이션의 모든 *경로 작동*에 적용될 것입니다:

{* ../../docs_src/dependencies/tutorial012_an_py39.py hl[16] *}

그리고 [*경로 작동 데코레이터*에 `dependencies` 추가하기](dependencies-in-path-operation-decorators.md){.internal-link target=_blank}에 대한 아이디어는 여전히 적용되지만 여기에서는 앱에 있는 모든 *경로 작동*에 적용됩니다.

## *경로 작동* 모음에 대한 의존성

     * @return session
     */
    SmbSession getSmbSession(CIFSContext ctx);

    /**
     * Gets or creates an SMB session for the specified target.
     *
     * @param tf the CIFS context
     * @param targetHost the target host name
     * @param targetDomain the target domain
     * @return session
     */
    SmbSession getSmbSession(CIFSContext tf, String targetHost, String targetDomain);

    /**

## Example { #example }

For a simple example, let's consider a file structure similar to the one described in [Bigger Applications](../tutorial/bigger-applications.md){.internal-link target=_blank} and [Testing](../tutorial/testing.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py

## Beispiel

Betrachten wir als einfaches Beispiel eine Dateistruktur ähnlich der in [Größere Anwendungen](../tutorial/bigger-applications.md){.internal-link target=_blank} und [Testen](../tutorial/testing.md){.internal-link target=_blank}:

```
.
├── app
│   ├── __init__.py

    }

    public void setTarget_Terms(ConditionOptionCall<TermsAggregationBuilder> opLambda) {
        setTarget_Terms("target", opLambda, null);
    }

    public void setTarget_Terms(ConditionOptionCall<TermsAggregationBuilder> opLambda, OperatorCall<BsThumbnailQueueCA> aggsLambda) {
        setTarget_Terms("target", opLambda, aggsLambda);
    }

Et les sections suivantes supposent que vous l'avez lu et que vous en connaissez les idées principales.

## Cours TestDriven.io