* chooses to short-circuit the graceful shutdown process:
 *
 *  * **Canceled:** the web socket connection failed. Messages that were successfully enqueued by
 *    either peer may not have been transmitted to the other.
 *
 * Note that the state progression is independent for each peer. Arriving at a gracefully-closed
 * state indicates that a peer has sent all of its outgoing messages and received all of its

    return try {
      // Attempt to get the trust manager from an OpenJDK socket factory. We attempt this on all
      // platforms in order to support Robolectric, which mixes classes from both Android and the
      // Oracle JDK. Note that we don't support HTTP/2 or other nice features on Robolectric.
      val sslContextClass = Class.forName("sun.security.ssl.SSLContextImpl")

    }

    fun build(): CacheControl = commonBuild()
  }

  companion object {
    /**
     * Cache control request directives that require network validation of responses. Note that such
     * requests may be assisted by the cache via conditional GET requests.
     */
    @JvmField
    val FORCE_NETWORK = commonForceNetwork()

    /**

     * Wait for the interrupting thread to set DONE. (See interruptTask().) We want to wait so that
     * the interrupting thread doesn't interrupt the _next_ thing to run on this thread.
     *
     * Note: We don't reset the interrupted bit, just wait for it to be set. If this is a thread
     * pool thread, the thread pool will reset it for us. Otherwise, the interrupted bit may have

   * during {@code Executor.execute} (e.g., a {@code RejectedExecutionException} or an exception
   * thrown by {@linkplain MoreExecutors#directExecutor direct execution}) will be caught and
   * logged.
   *
   * <p>Note: If your listener is lightweight -- and will not cause stack overflow by completing
   * more futures or adding more {@code directExecutor()} listeners inline -- consider {@link

   * outside the stated safe range. Subclasses should override this method to provide generalized
   * escaping for code points if required.
   *
   * <p>Note that arrays returned by this method must not be modified once they have been returned.
   * However it is acceptable to return the same array multiple times (even for different input
   * characters).
   *

<div class="termy">

```console
$ uvicorn main:app --host 0.0.0.0 --port 80

<span style="color: green;">INFO</span>:     Uvicorn running on http://0.0.0.0:80 (Press CTRL+C to quit)
```

</div>

/// note | "Nota"

O comando `uvicorn main:app` refere-se a:

* `main`: o arquivo `main.py` (o "módulo" Python).
* `app`: o objeto criado dentro de `main.py` com a linha `app = FastAPI()`.

É equivalente a:

{!../../docs_src/websockets/tutorial001.py!}
```

## 创建 `websocket`

在您的 **FastAPI** 应用程序中，创建一个 `websocket`：

```Python hl_lines="1  46-47"
{!../../docs_src/websockets/tutorial001.py!}
```

/// note | "技术细节"

您也可以使用 `from starlette.websockets import WebSocket`。

**FastAPI** 直接提供了相同的 `WebSocket`，只是为了方便开发人员。但它直接来自 Starlette。

///

## 等待消息并发送消息

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

## minio mode, i.e. standalone or distributed or gateway (nas) ## Distributed MinIO ref: https://docs.minio.io/docs/distributed-minio-quickstart-guide ## NAS Gateway MinIO ref: https://docs.min.io/docs/minio-gateway-for-nas.html mode: distributed ## NOTE: currently only "nas" gateway is supported. ## Additional labels to include with deployment or statefulset additionalLabels: [] ## Additional annotations to include with deployment or statefulset additionalAnnotation: [] ## Additional arguments to...

## minio mode, i.e. standalone or distributed or gateway (nas) ## Distributed MinIO ref: https://docs.minio.io/docs/distributed-minio-quickstart-guide ## NAS Gateway MinIO ref: https://docs.min.io/docs/minio-gateway-for-nas.html mode: distributed ## NOTE: currently only "nas" gateway is supported. ## Additional labels to include with deployment or statefulset additionalLabels: [] ## Additional annotations to include with deployment or statefulset additionalAnnotation: [] ## Additional arguments to...