participant dep as Dep with yield
participant operation as Path Operation
participant tasks as Background tasks

    Note over client,tasks: Can raise exception for dependency, handled after response is sent
    Note over client,operation: Can raise HTTPException and can change the response
    client ->> dep: Start request
    Note over dep: Run code up to yield
    opt raise
        dep -->> handler: Raise HTTPException

!!! note
    Notice that as we communicate with the database using `await`, the *path operation function* is declared with `async`.

### About `{**note.dict(), "id": last_record_id}`

`note` is a Pydantic `Note` object.

`note.dict()` returns a `dict` with its data, something like:

```Python
{
    "text": "Some note",
    "completed": False,
}
```

## Доступные версии

Вы можете посмотреть доступные версии (например, проверить последнюю на данный момент) в [примечаниях к выпуску](../release-notes.md){.internal-link target=_blank}.

## О версиях

Следуя соглашению о Семантическом Версионировании, любые версии ниже `1.0.0` потенциально могут добавить обратно несовместимые изменения.

Vous pouvez mettre votre contenu XML dans une chaîne de caractères, la placer dans une `Response`, et la retourner :

```Python hl_lines="1  18"
{!../../../docs_src/response_directly/tutorial002.py!}
```

## Notes

Lorsque vous renvoyez une `Response` directement, ses données ne sont pas validées, converties (sérialisées), ni documentées automatiquement.

  - newsletter.md
- About:
  - about/index.md
  - alternatives.md
  - history-design-future.md
  - benchmarks.md
- Help:
  - help/index.md
  - help-fastapi.md
  - contributing.md
- release-notes.md
markdown_extensions:
  toc:
    permalink: true
  markdown.extensions.codehilite:
    guess_lang: false
  mdx_include:
    base_path: docs
  admonition: null
  codehilite: null
  extra: null

```Python hl_lines="19-24 28"
{!../../../docs_src/additional_responses/tutorial002.py!}
```

!!! note "Remarque"
    Notez que vous devez retourner l'image en utilisant directement un `FileResponse`.

!!! info

## 用 `PATCH` 进行部分更新

<a href="https://developer.mozilla.org/zh-CN/docs/Web/HTTP/Methods/PATCH" class="external-link" target="_blank">HTTP `PATCH`</a> 操作用于更新 *部分* 数据。

即，只发送要更新的数据，其余数据保持不变。

!!! note "笔记"

    `PATCH` 没有 `PUT` 知名，也怎么不常用。

    很多人甚至只用 `PUT` 实现部分更新。

    **FastAPI** 对此没有任何限制，可以**随意**互换使用这两种操作。

    但本指南也会分别介绍这两种操作各自的用途。

### 使用 Pydantic 的 `exclude_unset` 参数

<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note "Технические детали"
    Команда `uvicorn main:app` обращается к:

    * `main`: файл `main.py` (модуль Python).
    * `app`: объект, созданный внутри файла `main.py` в строке `app = FastAPI()`.

    Notice that the testing functions are normal `def`, not `async def`.

    And the calls to the client are also normal calls, not using `await`.

    This allows you to use `pytest` directly without complications.

!!! note "Technical Details"
    You could also use `from starlette.testclient import TestClient`.

<span style="color: green;">INFO</span>:     Waiting for application startup.
<span style="color: green;">INFO</span>:     Application startup complete.
```

</div>

!!! note
    📋 `uvicorn main:app` 🔗:

    * `main`: 📁 `main.py` (🐍 "🕹").
    * `app`: 🎚 ✍ 🔘 `main.py` ⏮️ ⏸ `app = FastAPI()`.
    * `--reload`: ⚒ 💽 ⏏ ⏮️ 📟 🔀. 🕴 ⚙️ 🛠️.

🔢, 📤 ⏸ ⏮️ 🕳 💖:

```hl_lines="4"