* use of HTML templating systems.
 *
 * @author Sven Mawson
 * @author David Beaumont
 * @since 15.0
 */
@GwtCompatible
public final class HtmlEscapers {
  /**
   * Returns an {@link Escaper} instance that escapes HTML metacharacters as specified by <a
   * href="http://www.w3.org/TR/html4/">HTML 4.01</a>. The resulting strings can be used both in

/**
 * Implementation of {@link ImmutableSet} with two or more elements.
 *
 * @author Kevin Bourrillion
 */
@GwtCompatible
@SuppressWarnings("serial") // uses writeReplace(), not default serialization
final class RegularImmutableSet<E> extends ImmutableSet<E> {
  private static final Object[] EMPTY_ARRAY = new Object[0];
  static final RegularImmutableSet<Object> EMPTY =
      new RegularImmutableSet<>(EMPTY_ARRAY, 0, EMPTY_ARRAY, 0, 0);

    V onInvoke(Object p0);
  }
}

/** Subset of the elemental2 Promise API. */
@JsType(isNative = true, namespace = JsPackage.GLOBAL, name = "Promise")
class Promise<T extends @Nullable Object> implements IThenable<T> {

  @JsFunction
  interface PromiseExecutorCallbackFn<T extends @Nullable Object> {
    @JsFunction
    interface ResolveCallbackFn<T extends @Nullable Object> {

import org.eclipse.aether.artifact.ArtifactProperties;

/**
 * Maven GA level metadata.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Deprecated(since = "4.0.0")
final class VersionsMetadata extends MavenMetadata {

    private final Artifact artifact;

    VersionsMetadata(Artifact artifact, Date timestamp) {
        super(createRepositoryMetadata(artifact), (Path) null, timestamp);

In your top-level application, `app`, mount the sub-application, `subapi`.

In this case, it will be mounted at the path `/subapi`:

{* ../../docs_src/sub_applications/tutorial001_py310.py hl[11, 19] *}

### Check the automatic API docs { #check-the-automatic-api-docs }

Now, run the `fastapi` command:

<div class="termy">

```console
$ fastapi dev

{* ../../docs_src/json_base64_bytes/tutorial001_py310.py ln[1:9,29:35] hl[9] *}

Si vous allez sur les `/docs`, vous verrez que le champ `data` attend des octets encodés en base64 :

<div class="screenshot">
<img src="/img/tutorial/json-base64-bytes/image01.png">
</div>

Vous pourriez envoyer une requête comme :

```json
{
    "description": "Some data",
    "data": "aGVsbG8="
}
```

{* ../../docs_src/header_param_models/tutorial001_an_py310.py hl[9:14,18] *}

FastAPI 會從請求的標頭為每個欄位擷取資料，並交給你已定義的 Pydantic 模型實例。

## 檢視文件 { #check-the-docs }

你可以在 `/docs` 的文件介面看到所需的標頭：

<div class="screenshot">
<img src="/img/tutorial/header-param-models/image01.png">
</div>

## 禁止額外標頭 { #forbid-extra-headers }

在某些特殊情境（可能不常見）下，你可能想限制允許接收的標頭。

你可以使用 Pydantic 的模型設定來 `forbid` 任何 `extra` 欄位：

## Установка зависимостей { #install-dependencies }

Убедитесь, что вы создали [виртуальное окружение](../virtual-environments.md), активировали его и установили `jinja2`:

<div class="termy">

```console
$ pip install jinja2

---> 100%
```

</div>

## Использование `Jinja2Templates` { #using-jinja2templates }

- Импортируйте `Jinja2Templates`.

## Перевірка у документації { #check-the-docs }

Ви можете побачити визначені cookies в інтерфейсі документації за адресою `/docs`:

<div class="screenshot">
<img src="/img/tutorial/cookie-param-models/image01.png">
</div>

/// info | Інформація

## Bağımlılıkları Yükleme { #install-dependencies }

Bir [sanal ortam](../virtual-environments.md) oluşturduğunuzdan, etkinleştirdiğinizden ve `jinja2`'yi yüklediğinizden emin olun:

<div class="termy">

```console
$ pip install jinja2

---> 100%
```

</div>

## `Jinja2Templates` Kullanımı { #using-jinja2templates }

* `Jinja2Templates`'ı içe aktarın.