예를 들어 다른 <abbr title="Content Delivery Network - 콘텐츠 전송 네트워크">CDN</abbr>을 사용하고 싶다고 해봅시다. 예를 들면 `https://unpkg.com/`을 사용하려는 경우입니다.

이는 예를 들어 특정 국가에서 일부 URL을 제한하는 경우에 유용할 수 있습니다.

### 자동 문서 비활성화하기 { #disable-the-automatic-docs }

첫 번째 단계는 자동 문서를 비활성화하는 것입니다. 기본적으로 자동 문서는 기본 CDN을 사용하기 때문입니다.

비활성화하려면 `FastAPI` 앱을 생성할 때 해당 URL을 `None`으로 설정하세요:

{* ../../docs_src/custom_docs_ui/tutorial001_py310.py hl[8] *}

{* ../../docs_src/path_operation_configuration/tutorial002_py310.py hl[15,20,25] *}

They will be added to the OpenAPI schema and used by the automatic documentation interfaces:

<img src="/img/tutorial/path-operation-configuration/image01.png">

### Tags with Enums { #tags-with-enums }

 *   <li>{@code hc5} or not set - Use Apache HttpComponents 5.x ({@link Hc5HttpClient}) - default</li>
 * </ul>
 *
 * <p>This class extends {@link FaultTolerantClient} to provide automatic retry functionality
 * with the selected HTTP client implementation.</p>
 *
 * <p>Usage example:</p>
 * <pre>
 * {@code
 * // Use HC4 client
 * java -Dfess.crawler.http.client=hc4 ...
 *

`Header` 與 `Path`、`Query`、`Cookie` 是「姊妹」類別，同樣繼承自共同的 `Param` 類別。

但請記得，當你從 `fastapi` 匯入 `Query`、`Path`、`Header` 等時，它們其實是會回傳特殊類別的函式。

///

/// info | 說明

要宣告標頭，必須使用 `Header`，否則參數會被解讀為查詢參數。

///

## 自動轉換 { #automatic-conversion }

在 `Path`、`Query`、`Cookie` 提供的功能之上，`Header` 還有一些額外的小功能。

大多數標準標頭的單字以連字號（減號，`-`）分隔。

但像 `user-agent` 這樣的變數名稱在 Python 中是無效的。

因此，`Header` 會在預設情況下把參數名稱中的底線（`_`）轉換為連字號（`-`），以便讀取並在文件中顯示該標頭。

But you can still document it as described in [Additional Responses in OpenAPI](additional-responses.md).

최상위 애플리케이션 `app`에서 하위 애플리케이션 `subapi`를 마운트합니다.

이 경우 `/subapi` 경로에 마운트됩니다:

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

### 자동 API 문서 확인 { #check-the-automatic-api-docs }

이제 `fastapi` 명령어를 실행하세요:

<div class="termy">

```console
$ fastapi dev

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

This way, you can do the upgrade and make sure everything is still working as expected.

## `bump-pydantic` { #bump-pydantic }

In many cases, when you use regular Pydantic models without customizations, you will be able to automate most of the process of migrating from Pydantic v1 to Pydantic v2.

You can use [`bump-pydantic`](https://github.com/pydantic/bump-pydantic) from the same Pydantic team.

     * allowed. But at the same time, it seems wasteful to bother inserting the checkNotNull calls
     * that NullPointerTester wants.
     *
     * (This empty method disables the automatic null testing provided by PackageSanityTests.)
     */
  }

            handleManager.releaseHandle(getPath());
        }
    }
}

// Handle network errors with automatic reconnection
@Override
protected void handleNetworkError(IOException e) {
    if (handleType != null && handleType != HandleType.NONE) {
        // Attempt automatic reconnection
        HandleReconnector reconnector = new HandleReconnector(handleManager);
        try {

 * (or {@link FluentFuture#transform(com.google.common.base.Function, Executor)
 * FluentFuture.transform}), but you will often find it easier to use a framework. Frameworks
 * automate the process, often adding features like monitoring, debugging, and cancellation.
 * Examples of frameworks include:
 *
 * <ul>
 *   <li><a href="https://dagger.dev/producers.html">Dagger Producers</a>
 * </ul>
 *