"loc": ["body", "grant_type"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "grant_type"],
                    "msg": "field required",

                    "loc": ["body", "grant_type"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "grant_type"],
                    "msg": "field required",

                    "loc": ["body", "grant_type"],
                    "msg": "Field required",
                    "input": None,
                }
            ]
        }
    ) | IsDict(
        # TODO: remove when deprecating Pydantic v1
        {
            "detail": [
                {
                    "loc": ["body", "grant_type"],
                    "msg": "field required",

                sending the `client_id` and `client_secret` (if any) using HTTP Basic
                auth.
                """
            ),
        ] = None,
    ):
        self.grant_type = grant_type
        self.username = username
        self.password = password
        self.scopes = scope.split()
        self.client_id = client_id
        self.client_secret = client_secret

```

////

`OAuth2PasswordRequestForm` 🎓 🔗 👈 📣 📨 💪 ⏮️:

*  `username`.
*  `password`.
* 📦 `scope` 🏑 🦏 🎻, ✍ 🎻 🎏 🚀.
* 📦 `grant_type`.

/// tip

Oauth2️⃣ 🔌 🤙 *🚚* 🏑 `grant_type` ⏮️ 🔧 💲 `password`, ✋️ `OAuth2PasswordRequestForm` 🚫 🛠️ ⚫️.

🚥 👆 💪 🛠️ ⚫️, ⚙️ `OAuth2PasswordRequestFormStrict` ↩️ `OAuth2PasswordRequestForm`.

///

func (k *KeycloakProvider) LoginWithClientID(clientID, clientSecret string) error {
	values := url.Values{}
	values.Set("client_id", clientID)
	values.Set("client_secret", clientSecret)
	values.Set("grant_type", "client_credentials")

	req, err := http.NewRequest(http.MethodPost, k.oeConfig.TokenEndpoint, strings.NewReader(values.Encode()))
	if err != nil {
		return err
	}

* The `username`.
* The `password`.
* An optional `scope` field as a big string, composed of strings separated by spaces.
* An optional `grant_type`.

/// tip

The OAuth2 spec actually *requires* a field `grant_type` with a fixed value of `password`, but `OAuth2PasswordRequestForm` doesn't enforce it.

* Dem `username`.
* Dem `password`.
* Einem optionalen `scope`-Feld als langem String, bestehend aus durch Leerzeichen getrennten Strings.
* Einem optionalen `grant_type` („Art der Anmeldung“).

/// tip | "Tipp"

Die OAuth2-Spezifikation *erfordert* tatsächlich ein Feld `grant_type` mit dem festen Wert `password`, aber `OAuth2PasswordRequestForm` erzwingt dies nicht.

{!../../docs_src/security/tutorial003.py!}
```

`OAuth2PasswordRequestForm` 是用以下几项内容声明表单请求体的类依赖项：

* `username`
* `password`
* 可选的 `scope` 字段，由多个空格分隔的字符串组成的长字符串
* 可选的 `grant_type`

/// tip | "提示"

实际上，OAuth2 规范*要求* `grant_type` 字段使用固定值 `password`，但 `OAuth2PasswordRequestForm` 没有作强制约束。

如需强制使用固定值 `password`，则不要用 `OAuth2PasswordRequestForm`，而是用 `OAuth2PasswordRequestFormStrict`。

///

* 可选的 `client_id`（本例未使用）

                    "required": ["username", "password"],
                    "type": "object",
                    "properties": {
                        "grant_type": IsDict(
                            {
                                "title": "Grant Type",
                                "anyOf": [
                                    {"pattern": "password", "type": "string"},