## 文章

### 英文

{% if external_links %}
{% for article in external_links.articles.english %}

* <a href="{{ article.link }}" class="external-link" target="_blank">{{ article.title }}</a> by <a href="{{ article.author_link }}" class="external-link" target="_blank">{{ article.author }}</a>.
{% endfor %}

!!! tip "Tipp"
    Wenn Sie den Code zum Dokumentieren eines Callbacks schreiben, kann es hilfreich sein, sich vorzustellen, dass Sie dieser *externe Entwickler* sind. Und dass Sie derzeit die *externe API* implementieren, nicht *Ihre API*.

    * <a href="https://fastapi.tiangolo.com/features/" class="external-link" target="_blank">**Viele weitere Funktionen**</a>, einschließlich automatischer Validierung, Serialisierung, interaktiver Dokumentation, Authentifizierung...

Because of this, **FastAPI** itself provides an alternative API documentation (using ReDoc), which you can access at <a href="http://127.0.0.1:8000/redoc" class="external-link" target="_blank">http://127.0.0.1:8000/redoc</a>:

<img src="/img/tutorial/path-params/image02.png">

# Histoire, conception et avenir

Il y a quelque temps, <a href="https://github.com/tiangolo/fastapi/issues/3#issuecomment-454956920" class="external-link" target="_blank">un utilisateur de **FastAPI** a demandé</a> :

> Quelle est l'histoire de ce projet ? Il semble être sorti de nulle part et est devenu génial en quelques semaines [...].

Voici un petit bout de cette histoire.

## Alternatives

There are several alternatives, including:

* <a href="https://www.uvicorn.org/" class="external-link" target="_blank">Uvicorn</a>: a high performance ASGI server.
* <a href="https://pgjones.gitlab.io/hypercorn/" class="external-link" target="_blank">Hypercorn</a>: an ASGI server compatible with HTTP/2 and Trio among other features.
* <a href="https://github.com/django/daphne" class="external-link" target="_blank">Daphne</a>: the ASGI server built for Django Channels.

运行示例并访问 <a href="http://127.0.0.1:8000/items/3" class="external-link" target="_blank">http://127.0.0.1:8000/items/3</a>，返回的响应如下：

```JSON
{"item_id":3}
```

!!! check "检查"

    注意，函数接收并返回的值是 `3`（ `int`），不是 `"3"`（`str`）。

    **FastAPI** 通过类型声明自动<abbr title="将来自 HTTP 请求中的字符串转换为 Python 数据类型">**解析**请求中的数据</abbr>。

## 数据校验

👉 🖼 🚫 🛠️ ⏲ ⚫️ (👈 💪 ⏸ 📟), 🕴 🧾 🍕.

!!! tip
    ☑ ⏲ 🇺🇸🔍 📨.

    🕐❔ 🛠️ ⏲ 👆, 👆 💪 ⚙️ 🕳 💖 <a href="https://www.python-httpx.org" class="external-link" target="_blank">🇸🇲</a> ⚖️ <a href="https://requests.readthedocs.io/" class="external-link" target="_blank">📨</a>.

## ✍ ⏲ 🧾 📟

👉 📟 🏆 🚫 🛠️ 👆 📱, 👥 🕴 💪 ⚫️ *📄* ❔ 👈 *🔢 🛠️* 🔜 👀 💖.

✋️, 👆 ⏪ 💭 ❔ 💪 ✍ 🏧 🧾 🛠️ ⏮️ **FastAPI**.

* 업로드 된 파일의 메타데이터를 얻을 수 있습니다.
* <a href="https://docs.python.org/3/glossary.html#term-file-like-object" class="external-link" target="_blank">file-like</a>  `async` 인터페이스를 갖고 있습니다.
* file-like object를 필요로하는 다른 라이브러리에 직접적으로 전달할 수 있는 파이썬 <a href="https://docs.python.org/3/library/tempfile.html#tempfile.SpooledTemporaryFile" class="external-link" target="_blank">`SpooledTemporaryFile`</a> 객체를 반환합니다.

### `UploadFile`

`UploadFile` 은 다음과 같은 어트리뷰트가 있습니다:

Thanks to <a href="https://www.starlette.io/testclient/" class="external-link" target="_blank">Starlette</a>, testing **FastAPI** applications is easy and enjoyable.

It is based on <a href="https://www.python-httpx.org" class="external-link" target="_blank">HTTPX</a>, which in turn is designed based on Requests, so it's very familiar and intuitive.

With it, you can use <a href="https://docs.pytest.org/" class="external-link" target="_blank">pytest</a> directly with **FastAPI**.