Ele é baseado no <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a>, que por sua vez é projetado com base em Requests, por isso é muito familiar e intuitivo.

Com ele, você pode usar o <a href="https://docs.pytest.org/" class="external-link" target="_blank">pytest</a> diretamente com **FastAPI**.

## Usando `TestClient`

/// info | Informação

次のようなJSONレスポンスが表示されます:

```JSON
{"message": "Hello World"}
```

### 対話的APIドキュメント

次に、<a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>にアクセスします。

自動生成された対話的APIドキュメントが表示されます (<a href="https://github.com/swagger-api/swagger-ui" class="external-link" target="_blank">Swagger UI</a>で提供):

    /**
     * Complete this operation immediately with an oplock break if it would break an oplock
     */
    public static final int FILE_COMPLETE_IF_OPLOCKED = 0x100;
    /**
     * The client does not understand extended attributes
     */
    public static final int FILE_NO_EA_KNOWLEDGE = 0x200;
    /**
     * Open a remote instance of the file
     */

Це можна досягти за допомогою <a href="https://docs.pydantic.dev/latest/concepts/validators/#field-after-validator" class="external-link" target="_blank">Pydantic's `AfterValidator`</a> в середині `Annotated`.

/// tip | Підказка

FastAPI використовує `.dict()` моделі Pydantic з <a href="https://docs.pydantic.dev/1.10/usage/exporting_models/#modeldict" class="external-link" target="_blank">параметром `exclude_unset`</a>, щоб досягти цього.

///

/// info | Інформація

Ви також можете використовувати:

* `response_model_exclude_defaults=True`
* `response_model_exclude_none=True`

///

/// info | Информация

Вы также можете использовать:

* `response_model_exclude_defaults=True`
* `response_model_exclude_none=True`

Typically HTTP headers work like a `Map<String, String>`: each field has one value or none. But some headers permit multiple values, like Guava's [Multimap](https://guava.dev/releases/23.0/api/docs/com/google/common/collect/Multimap.html). For example, it's legal and common for an HTTP response to supply multiple `Vary` headers. OkHttp's APIs attempt to make both cases comfortable.

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

## 確認

次のインタラクティブなドキュメントにアクセスしてください: <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>。

下記のように見えるでしょう:

<img src="/img/tutorial/security/image01.png">

/// check | Authorizeボタン!

すでにピカピカの新しい「Authorize」ボタンがあります。

```console
$ fastapi dev main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

Luego dirígete a la interfaz de `/docs`, verás que **FastAPI** está usando estos **modelos** para **documentar** la API, y los usará para **serializar** y **validar** los datos también.

<div class="screenshot">
<img src="/img/tutorial/sql-databases/image01.png">

	}
	return dui
}

// replace will add or replace an entry in the cache.
// If a parent is specified it will be added to that if not already there.
// If the parent does not exist, it will be added.
func (d *dataUsageCache) replace(path, parent string, e dataUsageEntry) {
	hash := hashPath(path)
	if d.Cache == nil {
		d.Cache = make(map[string]dataUsageEntry, 100)
	}