<img src="/img/tutorial/websockets/image05.png">

## 切断や複数クライアントへの対応

WebSocket接続が閉じられると、 `await websocket.receive_text()` は例外 `WebSocketDisconnect` を発生させ、この例のようにキャッチして処理することができます。

```Python hl_lines="81-83"
{!../../../docs_src/websockets/tutorial003.py!}
```

試してみるには、

* いくつかのブラウザタブでアプリを開きます。
* それらのタブでメッセージを記入してください。
* そして、タブのうち1つを閉じてください。

  return String.format(Locale.US, format, *args)
}

@Throws(IOException::class)
internal fun BufferedSource.readBomAsCharset(default: Charset): Charset {
  return when (select(UNICODE_BOMS)) {
    0 -> UTF_8
    1 -> UTF_16BE
    2 -> UTF_16LE
    3 -> UTF_32BE
    4 -> UTF_32LE
    -1 -> default
    else -> throw AssertionError()
  }
}

internal fun checkDuration(
  name: String,
  duration: Long,

<img src="/img/tutorial/websockets/image05.png">

## 🚚 🔀 &amp; 💗 👩‍💻

🕐❔ *️⃣ 🔗 📪, `await websocket.receive_text()` 🔜 🤚 `WebSocketDisconnect` ⚠, ❔ 👆 💪 ⤴️ ✊ &amp; 🍵 💖 👉 🖼.

```Python hl_lines="81-83"
{!../../../docs_src/websockets/tutorial003.py!}
```

🔄 ⚫️ 👅:

* 📂 📱 ⏮️ 📚 🖥 📑.
* ✍ 📧 ⚪️➡️ 👫.
* ⤴️ 🔐 1️⃣ 📑.

👈 🔜 🤚 `WebSocketDisconnect` ⚠, &amp; 🌐 🎏 👩‍💻 🔜 📨 📧 💖:

    for (int exponent :
        asList(
            64,
            65,
            71,
            72,
            73,
            79,
            80,
            81,
            255,
            256,
            257,
            511,
            512,
            513,
            Double.MAX_EXPONENT - 1,
            Double.MAX_EXPONENT,

=== "🐍 3️⃣.6️⃣ & 🔛"

    ```Python hl_lines="80-83"
    {!> ../../../docs_src/security/tutorial003.py!}
    ```

=== "🐍 3️⃣.1️⃣0️⃣ & 🔛"

    ```Python hl_lines="78-81"
    {!> ../../../docs_src/security/tutorial003_py310.py!}
    ```

#### 🔃 `**user_dict`

`UserInDB(**user_dict)` ⛓:

*🚶‍♀️ 🔑 & 💲 `user_dict` 🔗 🔑-💲 ❌, 🌓:*

```Python
UserInDB(

	},
	{ // 5
		ETag:   ETag{32, 0, 15, 0, 219, 45, 144, 167, 180, 7, 130, 212, 207, 242, 180, 26, 119, 153, 252, 30, 126, 173, 37, 151, 45, 182, 81, 80, 17, 141, 251, 226, 186, 118, 163, 192, 2, 218, 40, 248, 92, 132, 12, 210, 0, 26, 40, 169},
		String: "20000f00db2d90a7b40782d4cff2b41a7799fc1e7ead25972db65150118dfbe2ba76a3c002da28f85c840cd2001a28a9",
	},
}

{\fonttbl\f0\fswiss\fcharset77 Helvetica-Bold;} {\colortbl;\red255\green255\blue255;} \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\qc \f0\b\fs24 \cf0 \ul \ulc0 LifecycleBindingMana}ID68Bounds{{108.828, 81.9091}, {81, 14}}ClassShapedGraphicFi.909090042114258Posit.520068883895874Rotat{\rtf1\mac\ansicpg10000\cocoartf824\cocoasubrtf410 {\fonttbl\f0\fswiss\fcharset77 Helvetica;} {\colortbl;\red255\green255\blue255;} \pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx...

    // exchanging two blocks of memory). This classic text by Gries and Mills mentions several:
    // https://ecommons.cornell.edu/bitstream/handle/1813/6292/81-452.pdf.
    // (1) "Reversal", the one we have here.
    // (2) "Dolphin". If we're rotating an array a of size n by a distance of d, then element a[0]

=== "P파이썬 3.7 이상"

    ```Python hl_lines="80-83"
    {!> ../../../docs_src/security/tutorial003.py!}
    ```

=== "파이썬 3.10 이상"

    ```Python hl_lines="78-81"
    {!> ../../../docs_src/security/tutorial003_py310.py!}
    ```

#### `**user_dict`에 대해

`UserInDB(**user_dict)`는 다음을 의미한다:

*`user_dict`의 키와 값을 다음과 같은 키-값 인수로 직접 전달합니다:*

```Python

  private static final ImmutableList<Integer> SIXTEEN_SQUARES_INTEGERS =
      ImmutableList.of(25, 100, 0, 144, 9, 121, 4, 225, 169, 64, 49, 16, 36, 1, 81, 196);
  private static final double SIXTEEN_SQUARES_MIN = 0.0;
  private static final double SIXTEEN_SQUARES_DECILE_1 = 0.5 * (1.0 + 4.0);
  private static final double SIXTEEN_SQUARES_QUARTILE_1 = 0.25 * 9.0 + 0.75 * 16.0;