## 自定义头部

请注意，可以使用'X-'前缀添加自定义专有头部。

    }

    public PluginContainerException(Plugin plugin, ClassRealm pluginRealm, String message, Throwable e) {
        super(plugin, message, e);

        this.pluginRealm = pluginRealm;
    }

    /**
     * Ctor left for binary compatibility.
     *
     * @deprecated Use {@link #PluginContainerException(Plugin, ClassRealm, String, Throwable)}
     */
    @Deprecated
    public PluginContainerException(

      - name: Setup tmate session
        uses: mxschmitt/action-tmate@v3
        if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.debug_enabled == 'true' }}
        with:
          limit-access-to-actor: true
      - uses: ./.github/actions/notify-translations
        with:

# 高级中间件

用户指南介绍了如何为应用添加[自定义中间件](../tutorial/middleware.md){.internal-link target=_blank} 。

以及如何[使用 `CORSMiddleware` 处理 CORS](../tutorial/cors.md){.internal-link target=_blank}。

本章学习如何使用其它中间件。

## 添加 ASGI 中间件

因为 **FastAPI** 基于 Starlette，且执行 <abbr title="Asynchronous Server Gateway Interface，异步服务器网关界面">ASGI</abbr> 规范，所以可以使用任意 ASGI 中间件。

中间件不必是专为 FastAPI 或 Starlette 定制的，只要遵循 ASGI 规范即可。

总之，ASGI 中间件是类，并把 ASGI 应用作为第一个参数。

      - name: Setup tmate session
        uses: mxschmitt/action-tmate@v3
        if: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.debug_enabled == 'true' }}
        with:
          limit-access-to-actor: true
      - uses: ./.github/actions/people
        with:

    private String language;

    @Deprecated
    private boolean addedToClasspath;

    /**
     * Default ctor for Plexus compatibility, as many plugins have artifact handlers declared in legacy Plexus XML.
     * Do not use directly!
     *
     * @deprecated This ctor is present only for Plexus XML defined component compatibility, do not use it.
     */
    @Deprecated
    public DefaultArtifactHandler() {

Lesen Sie mehr darüber in der [FastAPI-Dokumentation über Middleware](../advanced/middleware.md).

::: fastapi.middleware.cors.CORSMiddleware

Kann von `fastapi` importiert werden:

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

::: fastapi.middleware.gzip.GZipMiddleware

Kann von `fastapi` importiert werden:

```python

# 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

	if corsList == "" {
		corsAllowOrigin = []string{"*"} // defaults to '*'
	} else {
		corsAllowOrigin = strings.Split(corsList, ",")
		for _, cors := range corsAllowOrigin {
			if cors == "" {
				return cfg, errors.New("invalid cors value")
			}
		}
	}
	cfg.CorsAllowOrigin = corsAllowOrigin

	if err = config.CheckValidKeys(config.APISubSys, kvs, DefaultKVS, deprecatedKeys...); err != nil {

    }
  }

  /**
   * Verifies that {@code ctor} produces a {@link NullPointerException} or {@link
   * UnsupportedOperationException} whenever <i>any</i> of its non-nullable parameters are null.
   */
  public void testConstructor(Constructor<?> ctor) {
    Class<?> declaringClass = ctor.getDeclaringClass();
    checkArgument(
        Modifier.isStatic(declaringClass.getModifiers())