# WebSockets

您可以在 **FastAPI** 中使用 [WebSockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API)。

## 安装 `WebSockets`

首先，您需要安装 `WebSockets`：

```console
$ pip install websockets

---> 100%
```

## WebSockets 客户端

### 在生产环境中

在您的生产系统中，您可能使用现代框架（如React、Vue.js或Angular）创建了一个前端。

要使用 WebSockets 与后端进行通信，您可能会使用前端的工具。

或者，您可能有一个原生移动应用程序，直接使用原生代码与 WebSocket 后端通信。

或者，您可能有其他与 WebSocket 终端通信的方式。

    return false;
  }

  // Prevent "missing hashCode" warning by explicitly forcing subclasses implement it
  @Override
  public abstract int hashCode();

  /*
   * The implementation neither produces nor consumes any non-null instance of type C, so
   * casting the type parameter is safe.
   */
  @SuppressWarnings("unchecked")
  static <C extends Comparable> Cut<C> belowAll() {
    return (Cut<C>) BelowAll.INSTANCE;
  }

vm.swappiness=0
vm.vfs_cache_pressure=50

# Start writeback at 3% memory
vm.dirty_background_ratio=3
# Force writeback at 10% memory
vm.dirty_ratio=10

# Quite a few memory map
# areas may be consumed
vm.max_map_count=524288

# Default is 500000 = 0.5ms
kernel.sched_migration_cost_ns=5000000

# stalled hdd io threads
kernel.hung_task_timeout_secs=85

# network tuning for bigger throughput

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

Ele detectará os arquivos e os testes automaticamente, os executará e informará os resultados para você.

Execute os testes com:

<div class="termy">

```console
$ pytest

================ test session starts ================

Để chạy bất kì ví dụ nào, sao chép code tới tệp tin `main.py`, và bắt đầu `uvicorn` với:

<div class="termy">

```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)
<span style="color: green;">INFO</span>:     Started reloader process [28720]

<div class="termy">

```console
$ python myapp.py
```

</div>

but is not called when another file imports it, like in:

```Python
from myapp import app
```

#### More details

Let's say your file is named `myapp.py`.

If you run it with:

<div class="termy">

```console
$ python myapp.py
```

</div>

<div class="termy">

```console
$ pip install pytest

---> 100%
```

</div>

It will detect the files and tests automatically, execute them, and report the results back to you.

Run the tests with:

<div class="termy">

```console
$ pytest

================ test session starts ================

inistration/identity-access-management/minio-user-management.html#service-accounts # - accessKey: console-svcacct # secretKey: console123 # user: console ## Or you can refer to specific secret # - accessKey: externalSecret # existingSecret: my-secret # existingSecretKey: password # user: console ## You also can pass custom policy # - accessKey: console-svcacct # secretKey: console123 # user: console # policy: # statements: # - resources: # - 'arn:aws:s3:::example*/*' # actions: # - "s3:AbortMultipartUpload"...

inistration/identity-access-management/minio-user-management.html#service-accounts # - accessKey: console-svcacct # secretKey: console123 # user: console ## Or you can refer to specific secret # - accessKey: externalSecret # existingSecret: my-secret # existingSecretKey: password # user: console ## You also can pass custom policy # - accessKey: console-svcacct # secretKey: console123 # user: console # policy: # statements: # - resources: # - 'arn:aws:s3:::example*/*' # actions: # - "s3:AbortMultipartUpload"...

inistration/identity-access-management/minio-user-management.html#service-accounts # - accessKey: console-svcacct # secretKey: console123 # user: console ## Or you can refer to specific secret # - accessKey: externalSecret # existingSecret: my-secret # existingSecretKey: password # user: console ## You also can pass custom policy # - accessKey: console-svcacct # secretKey: console123 # user: console # policy: # statements: # - resources: # - 'arn:aws:s3:::example*/*' # actions: # - "s3:AbortMultipartUpload"...