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We can also use this same approach to access the request body in an exception handler.

All we need to do is handle the request inside a `try`/`except` block:

```Python hl_lines="13  15"
{!../../../docs_src/custom_request_and_route/tutorial002.py!}
```

You will see something like this:

<img src="/img/tutorial/security/image01.png">

!!! check "Authorize button!"
    You already have a shiny new "Authorize" button.

    And your *path operation* has a little lock in the top-right corner that you can click.

And if you click it, you have a little authorization form to type a `username` and `password` (and other optional fields):

<img src="/img/tutorial/security/image02.png">

2. `/tmp`를 현재의 워킹 디렉터리로 설정합니다.

    이 위치에 우리는 `requirements.txt` 파일을 생성할 것입니다.

3. 이 도커 스테이지에서 Poetry를 설치합니다.

4. 파일 `pyproject.toml`와 `poetry.lock`를 `/tmp` 디렉터리로 복사합니다.

    `./poetry.lock*` (`*`로 끝나는) 파일을 사용하기 때문에, 파일이 아직 사용가능하지 않더라도 고장나지 않을 것입니다.

5. `requirements.txt` 파일을 생성합니다.

6. 이것이 마지막 스테이지로, 여기에 위치한 모든 것이 마지막 컨테이너 이미지에 포함될 것입니다.

7. 현재의 워킹 디렉터리를 `/code`로 설정합니다.

```Python
async def do_something():
    try:
        yield something
    finally:
        some_cleanup()
```

...that way the `finally` block is run regardless of any exception that might happen.

### Features

```Python
async with lifespan(app):
    await do_stuff()
```

When you create a context manager or an async context manager like above, what it does is that, before entering the `with` block, it will execute the code before the `yield`, and after exiting the `with` block, it will execute the code after the `yield`.

In our code example above, we don't use it directly, but we pass it to FastAPI for it to use it.

    {!> ../../../docs_src/sql_databases/sql_app/main.py!}
    ```

!!! info
    We put the creation of the `SessionLocal()` and handling of the requests in a `try` block.

    And then we close it in the `finally` block.

    This way we make sure the database session is always closed after the request. Even if there was an exception while processing the request.

```

!!! tip
    You can use `async` or regular functions.

    **FastAPI** will do the right thing with each, the same as with normal dependencies.

## A dependency with `yield` and `try`

If you use a `try` block in a dependency with `yield`, you'll receive any exception that was thrown when using the dependency.

1️⃣. 👉 🥇 ▶️, ⚫️ 🌟 `requirements-stage`.

2️⃣. ⚒ `/tmp` ⏮️ 👷 📁.

    📥 🌐❔ 👥 🔜 🏗 📁 `requirements.txt`

3️⃣. ❎ 🎶 👉 ☁ ▶️.

4️⃣. 📁 `pyproject.toml` & `poetry.lock` 📁 `/tmp` 📁.

    ↩️ ⚫️ ⚙️ `./poetry.lock*` (▶️ ⏮️ `*`), ⚫️ 🏆 🚫 💥 🚥 👈 📁 🚫 💪.

5️⃣. 🏗 `requirements.txt` 📁.

6️⃣. 👉 🏁 ▶️, 🕳 📥 🔜 🛡 🏁 📦 🖼.

7️⃣. ⚒ ⏮️ 👷 📁 `/code`.

```

1. これは最初のステージで、`requirements-stage`と名付けられます
2. `/tmp` を現在の作業ディレクトリに設定します
    ここで `requirements.txt` というファイルを生成します。

3. このDockerステージにPoetryをインストールします

4. pyproject.toml`と`poetry.lock`ファイルを`/tmp` ディレクトリにコピーします

    `./poetry.lock*`（末尾に`*`）を使用するため、そのファイルがまだ利用できない場合でもクラッシュすることはないです。
5. requirements.txt`ファイルを生成します

6. これは最後のステージであり、ここにあるものはすべて最終的なコンテナ・イメージに保存されます
7. 現在の作業ディレクトリを `/code` に設定します