the corresponding iteration value will not be produced. If a map entry is
created during iteration, that entry may be produced during the iteration or
may be skipped. The choice may vary for each entry created and from one
iteration to the next.
If the map is <code>nil</code>, the number of iterations is 0.
</li>

<li>
For channels, the iteration values produced are the successive values sent on

 * "The .NET Developer's Guide to Windows Security" (which is also
 * available online).
 * <p>
 * Direct ACEs are evaluated first in order. The SID of the user performing
 * the operation and the desired access bits are compared to the SID
 * and access mask of each ACE. If the SID matches, the allow/deny flags
 * and access mask are considered. If the ACE is a "deny"

   * which is still better than alternatives.
   *
   * Per-thread hash codes are initialized to random values.
   * Contention and/or table collisions are indicated by failed
   * CASes when performing an update operation (see method
   * retryUpdate). Upon a collision, if the table size is less than
   * the capacity, it is doubled in size unless some other thread
   * holds the lock. If a hashed slot is empty, and lock is

次に、この例を拡張し、詳細を追加して、さまざまなパーツをテストする方法を確認しましょう。


### 拡張版 **FastAPI** アプリファイル

**FastAPI** アプリに `main_b.py` ファイルがあるとします。

そのファイルには、エラーを返す可能性のある `GET` オペレーションがあります。

また、いくつかのエラーを返す可能性のある `POST` オペレーションもあります。

これらの *path operation* には `X-Token` ヘッダーが必要です。

//// tab | Python 3.10+

```Python
{!> ../../docs_src/app_testing/app_b_py310/main.py!}
```

////

//// tab | Python 3.6+

```Python

	// Header indiicates last rtention update time on source
	MinIOSourceObjectLegalHoldTimestamp = "X-Minio-Source-Replication-LegalHold-Timestamp"
	// Header indicates a Tag operation was performed on one/more peers successfully, though the
	// current cluster does not have the object yet. This is in a site/bucket replication scenario.
	MinIOTaggingProxied = "X-Minio-Tagging-Proxied"

$element.trigger($.Event(EVENT_EXPANDED))\n    }\n  }\n\n  // Static\n\n  static _jQueryInterface(operation) {\n    return this.each(function () {\n      let data = $(this).data(DATA_KEY)\n\n      if (!data) {\n        data = new ExpandableTable($(this))\n        $(this).data(DATA_KEY, data)\n      }\n\n      if (typeof operation === 'string' && /init|toggleRow/.test(operation)) {\n        data[operation]()\n      }\n    })\n  }\n}\n\n/**\n  * Data API\n  * ====================================================\n...

重複したヘッダーのすべての値をPythonの`list`として受け取ることができます。

例えば、複数回出現する可能性のある`X-Token`のヘッダを定義するには、以下のように書くことができます:

```Python hl_lines="9"
{!../../docs_src/header_params/tutorial003.py!}
```

もし、その*path operation*で通信する場合は、次のように２つのHTTPヘッダーを送信します:

```
X-Token: foo
X-Token: bar
```

このレスポンスは以下のようになります:

```JSON
{
    "X-Token values": [
        "bar",
        "foo"
    ]
}
```

## まとめ

/// tip | "Dica"

Observe que, assim como [dependências em *decoradores de operação de rota*](dependencies/dependencies-in-path-operation-decorators.md){.internal-link target=_blank}, nenhum valor será passado para sua *função de operação de rota*.

///

O resultado final é que os caminhos dos itens agora são:

* `/items/`
* `/items/{item_id}`

                            "content": {"application/json": {"schema": {}}},
                        },
                        "404": {"description": "Not found"},
                        "403": {"description": "Operation forbidden"},
                        "422": {
                            "description": "Validation Error",
                            "content": {
                                "application/json": {

      }
    }

    /**
     * Throws UnsupportedOperationException. A future version may support this operation. Then the
     * value for any given key will be the one that was last supplied in a {@code put} operation for
     * that key.
     *
     * @throws UnsupportedOperationException always
     * @since 31.1