@app.post("/login")
    def login(form_data: Annotated[OAuth2PasswordRequestForm, Depends()]):
        data = {}
        data["scopes"] = []
        for scope in form_data.scopes:
            data["scopes"].append(scope)
        if form_data.client_id:
            data["client_id"] = form_data.client_id
        if form_data.client_secret:
            data["client_secret"] = form_data.client_secret
        return data
    ```

You can combine `dataclasses` with other type annotations in many different combinations to form complex data structures.

Check the in-code annotation tips above to see more specific details.

## Learn More

You can also combine `dataclasses` with other Pydantic models, inherit from them, include them in your own models, etc.

            Swagger UI (that provides the `/docs` interface) has better support for the
            OpenAPI-specific examples than the JSON Schema `examples`, that's the main
            use case for this.

            Read more about it in the
            [FastAPI docs for Declare Request Example Data](https://fastapi.tiangolo.com/tutorial/schema-extra-example/#using-the-openapi_examples-parameter).

And there was a web user interface for Swagger APIs already created. So, being able to generate Swagger documentation for an API would allow using this web user interface automatically.

At some point, Swagger was given to the Linux Foundation, to be renamed OpenAPI.

That's why when talking about version 2.0 it's common to say "Swagger", and for version 3+ "OpenAPI".

!!! check "Inspired **FastAPI** to"

* To pass a JSON body, pass a Python object (e.g. a `dict`) to the parameter `json`.
* If you need to send *Form Data* instead of JSON, use the `data` parameter instead.
* To pass *headers*, use a `dict` in the `headers` parameter.
* For *cookies*, a `dict` in the `cookies` parameter.

`Form`では`Body`（および`Query`や`Path`、`Cookie`）と同じメタデータとバリデーションを宣言することができます。

!!! info "情報"
    `Form`は`Body`を直接継承するクラスです。

!!! tip "豆知識"
    フォームのボディを宣言するには、明示的に`Form`を使用する必要があります。なぜなら、これを使わないと、パラメータはクエリパラメータやボディ（JSON）パラメータとして解釈されるからです。

## 「フォームフィールド」について

HTMLフォーム（`<form></form>`）がサーバにデータを送信する方法は、通常、そのデータに「特別な」エンコーディングを使用していますが、これはJSONとは異なります。

!!! warning "Внимание"
    Вы можете объявить несколько параметров `File` и `Form` в операции *path*, но вы не можете также объявить поля `Body`, которые вы ожидаете получить в виде JSON, так как запрос будет иметь тело, закодированное с помощью `multipart/form-data` вместо `application/json`.

    Это не ограничение **Fast API**, это часть протокола HTTP.

## Резюме

    client = TestClient(app)
    return client


def test_post_body_form(client: TestClient):
    response = client.post("/login/", data={"username": "Foo", "password": "secret"})
    assert response.status_code == 200
    assert response.json() == {"username": "Foo"}


def test_post_body_form_no_password(client: TestClient):
    response = client.post("/login/", data={"username": "Foo"})

The `name="static"` gives it a name that can be used internally by **FastAPI**.

All these parameters can be different than "`static`", adjust them with the needs and specific details of your own application.

## More info

## ⚫️❔ "📨 💽"

🌌 🕸 📨 (`<form></form>`) 📨 💽 💽 🛎 ⚙️ "🎁" 🔢 👈 📊, ⚫️ 🎏 ⚪️➡️ 🎻.

**FastAPI** 🔜 ⚒ 💭 ✍ 👈 📊 ⚪️➡️ ▶️️ 🥉 ↩️ 🎻.

!!! note "📡 ℹ"
    📊 ⚪️➡️ 📨 🛎 🗜 ⚙️ "📻 🆎" `application/x-www-form-urlencoded` 🕐❔ ⚫️ 🚫 🔌 📁.

    ✋️ 🕐❔ 📨 🔌 📁, ⚫️ 🗜 `multipart/form-data`. 🚥 👆 ⚙️ `File`, **FastAPI** 🔜 💭 ⚫️ ✔️ 🤚 📁 ⚪️➡️ ☑ 🍕 💪.