///

У каждого альтернативного ASGI‑сервера будет похожая команда; подробнее см. в их документации.

/// warning | Предупреждение

Uvicorn и другие серверы поддерживают опцию `--reload`, полезную в период разработки.

Опция `--reload` потребляет значительно больше ресурсов, менее стабильна и т.п.

Она сильно помогает во время **разработки**, но в **продакшн** её использовать **не следует**.

///

在您的 WebSocket 路由中，您可以使用 `await` 等待消息并发送消息。

{* ../../docs_src/websockets/tutorial001.py hl[48:52] *}

您可以接收和发送二进制、文本和 JSON 数据。

## 尝试一下

如果您的文件名为 `main.py`，请使用以下命令运行应用程序：

```console
$ uvicorn main:app --reload

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

在浏览器中打开 <a href="http://127.0.0.1:8000" class="external-link" target="_blank">http://127.0.0.1:8000</a>。

## `fastapi dev`

執行 `fastapi dev` 會啟動開發模式。

預設情況下，**auto-reload** 功能是啟用的，當你對程式碼進行修改時，伺服器會自動重新載入。這會消耗較多資源，並且可能比禁用時更不穩定。因此，你應該只在開發環境中使用此功能。它也會在 IP 位址 `127.0.0.1` 上監聽，這是用於你的機器與自身通訊的 IP 位址（`localhost`）。

## `fastapi run`

執行 `fastapi run` 會以生產模式啟動 FastAPI。

預設情況下，**auto-reload** 功能是禁用的。它也會在 IP 位址 `0.0.0.0` 上監聽，表示會監聽所有可用的 IP 地址，這樣任何能與該機器通訊的人都可以公開存取它。這通常是你在生產環境中運行應用程式的方式，例如在容器中運行時。

    System.setProperty("javax.net.debug", "")
    return OkHttpDebugLogging.enable(
      "javax.net.ssl",
      object : Handler() {
        override fun publish(record: LogRecord) {
          val param = record.parameters?.firstOrNull() as? String
          debugHandler(JsseDebugMessage(record.message, param))
        }

        override fun flush() {
        }

        override fun close() {
        }
      },
    )
  }

    CacheLoader<Object, Object> loader =
        new CacheLoader<Object, Object>() {
          @Override
          public Object load(Object key) {
            return one;
          }

          @Override
          public ListenableFuture<Object> reload(Object key, Object oldValue) {
            return immediateFuture(two);
          }
        };

Cada programa de servidor ASGI alternativo teria um comando semelhante, você pode ler mais na documentação respectiva.

/// warning | Atenção

Uvicorn e outros servidores suportam a opção `--reload` que é útil durante o desenvolvimento.

A opção `--reload` consome muito mais recursos, é mais instável, etc.

Ela ajuda muito durante o **desenvolvimento**, mas você **não deve** usá-la em **produção**.

///

        final DynamicProperties systemProperties = ComponentUtil.getSystemProperties();

        if (StringUtil.isNotBlank(options.propertiesPath)) {
            systemProperties.reload(options.propertiesPath);
        } else {
            try {
                final File propFile = ComponentUtil.getSystemHelper().createTempFile("thumbnail_", ".properties");

   * CacheLoader#reload}.
   *
   * <p>As the default implementation of {@link CacheLoader#reload} is synchronous, it is
   * recommended that users of this method override {@link CacheLoader#reload} with an asynchronous
   * implementation; otherwise refreshes will be performed during unrelated cache read and write
   * operations.
   *

```console
$ uvicorn main:app --reload

INFO:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
INFO:     Started reloader process [28720]
INFO:     Started server process [28722]
INFO:     Waiting for application startup.
INFO:     Application startup complete.
```

</div>

<details markdown="1">
<summary><code>uvicorn main:app --reload</code> 명령에 관하여...</summary>

### Test it { #test-it }

Now, you should be able to go to your docs at <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>, and reload the page, it will load those assets from the new CDN.

## Self-hosting JavaScript and CSS for docs { #self-hosting-javascript-and-css-for-docs }