Si quieres instalar las dependencias estándar pero sin `fastapi-cloud-cli`, puedes instalar con `pip install "fastapi[standard-no-fastapi-cloud-cli]"`.

///

/// tip | Consejo

There you can set:

* The "Item ID", used in the path.
* The "Token" used as a query parameter.

/// tip

Notice that the query `token` will be handled by a dependency.

///

With that you can connect the WebSocket and then send and receive messages:

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

## Handling disconnections and multiple clients { #handling-disconnections-and-multiple-clients }

## Kontextmanager { #context-managers }

### Was sind „Kontextmanager“ { #what-are-context-managers }

„Kontextmanager“ (Englisch „Context Manager“) sind bestimmte Python-Objekte, die Sie in einer `with`-Anweisung verwenden können.

- `close()`: ファイルを閉じます。

これらはすべて `async` メソッドなので、`await` する必要があります。

例えば、`async` の *path operation 関数* 内では次のように内容を取得できます:

```Python
contents = await myfile.read()
```

通常の `def` の *path operation 関数* 内にいる場合は、`UploadFile.file` に直接アクセスできます。例えば:

```Python
contents = myfile.file.read()
```

/// note | `async` の技術詳細

`async` メソッドを使うと、**FastAPI** はファイルメソッドをスレッドプールで実行し、その完了を待機します。

///

      names, trademarks, service marks, or product names of the Licensor,
      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

   7. Disclaimer of Warranty. Unless required by applicable law or
      agreed to in writing, Licensor provides the Work (and each
      Contributor provides its Contributions) on an "AS IS" BASIS,

     */
    public DictionaryFile<T> manager(final DictionaryManager dictionaryManager) {
        this.dictionaryManager = dictionaryManager;
        return this;
    }

    /**
     * Writes the content of this dictionary file to the provided output stream.
     *
     * @param out the output stream to write to
     * @throws IOException if an I/O error occurs during writing
     */

      sink.flush()
    }
  }

  /**
   * Send a connection-level ping to the peer. `ack` indicates this is a reply. The data in
   * `payload1` and `payload2` opaque binary, and there are no rules on the content.
   */
  @Throws(IOException::class)
  fun ping(
    ack: Boolean,
    payload1: Int,
    payload2: Int,
  ) {
    withLock {
      if (closed) throw IOException("closed")
      frameHeader(

        // Encrypt
        byte[] encrypted = storage.encryptCredentials(plaintext);
        assertNotNull(encrypted, "Encrypted data should not be null");
        assertTrue(encrypted.length > 0, "Encrypted data should have content");

        // Verify plaintext is not in encrypted data
        String encryptedStr = new String(encrypted);
        assertFalse(encryptedStr.contains("SecretPassword123"), "Plaintext should not be visible in encrypted data");

Pero obtendrías el mismo soporte en el editor con [PyCharm](https://www.jetbrains.com/pycharm/) y la mayoría de los otros editores de Python:

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

/// tip | Consejo

Si usas [PyCharm](https://www.jetbrains.com/pycharm/) como tu editor, puedes usar el [Pydantic PyCharm Plugin](https://github.com/koxudaxi/pydantic-pycharm-plugin/).

```json
{
    // Это пример блока кода на JSON
    "greeting": "Hello, world!" // Печать приветствия
}
```


### Блоки кода с комментариями, где язык использует другие стили комментариев { #code-blocks-with-different-comment-styles }

Следующие блоки кода содержат комментарии в разных стилях в зависимости от языка.
Инструмент исправления не будет сохранять комментарии в этих блоках.

```json
{
    # This is a sample JSON code block