安装命令： `pip install python-multipart`。

这是因为 **OAuth2** 使用**表单数据**发送 `username` 与 `password`。

///

用下面的命令运行该示例：

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

## 查看文档

	Isso ocorre porque o **OAuth2** usa "dados de um formulário" para mandar o **username** e **senha**.

Execute esse exemplo com:

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

## Verifique-o

///

## ✅ 🏧 🛠️ 🩺

🔜, 🏃 `uvicorn`, ⚙️ 🕹 `app.main` & 🔢 `app`:

<div class="termy">

```console
$ uvicorn app.main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

&amp; 📂 🩺 <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

<div class="termy">

```console
$ ADMIN_EMAIL="******@****.***" APP_NAME="ChimichangApp" uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

/// tip | "Tipp"

is-a-candidate.org is-a-caterer.com is-a-celticsfan.org is-a-chef.com is-a-chef.net is-a-chef.org is-a-conservative.com is-a-cpa.com is-a-cubicle-slave.com is-a-democrat.com is-a-designer.com is-a-doctor.com is-a-financialadvisor.com is-a-geek.com is-a-geek.net is-a-geek.org is-a-green.com is-a-guru.com is-a-hard-worker.com is-a-hunter.com is-a-knight.org is-a-landscaper.com is-a-lawyer.com is-a-liberal.com is-a-libertarian.com is-a-linux-user.org is-a-llama.com is-a-musician.com is-a-nascarfan.com is-a-nurse.com...

            assertEquals(newHashSet(elements), multimap.get("foo"));
          }
        };

    tester.test();
  }

  private enum Color {
    BLUE,
    RED,
    YELLOW,
    GREEN
  }

  private abstract static class CountingSupplier<E> implements Supplier<E>, Serializable {
    int count;

    abstract E getImpl();

    @Override
    public E get() {
      count++;

⏭, 👆 🔜 🏃 💽 🚶‍♀️ 📳 🌐 🔢, 🖼 👆 💪 ⚒ `ADMIN_EMAIL` & `APP_NAME` ⏮️:

<div class="termy">

```console
$ ADMIN_EMAIL="******@****.***" APP_NAME="ChimichangApp" uvicorn main:app

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

/// tip

⚒ 💗 🇨🇻 {👁 📋 🎏 👫 ⏮️ 🚀, &amp; 🚮 👫 🌐 ⏭ 📋.

///

///

## Check the automatic API docs

Now, run your app:

<div class="termy">

```console
$ fastapi dev app/main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

<div class="termy">

```console
$ ADMIN_EMAIL="******@****.***" APP_NAME="ChimichangApp" fastapi run main.py

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
```

</div>

/// tip

Veri doğrulama, veri dönüştürme ve dökümantasyon için Pydantic gibi bir üçüncü parti kütüphane kullanmıyor, kendi içerisinde bunlara sahip. Yani bu veri tipi tanımlarını tekrar kullanmak pek de kolay değil.