Request

```
curl -u <CLIENT_ID>:<CLIENT_SECRET> -k -d "grant_type=client_credentials" -H "Content-Type:application/x-www-form-urlencoded" https://<IS_HOST>:<IS_HTTPS_PORT>/oauth2/token
```

Example:

```
curl -u PoEgXP6uVO45IsENRngDXj5Au5Ya:eKsw6z8CtOJVBtrOWvhRWL4TUCga -k -d "grant_type=client_credentials" -H "Content-Type:application/x-www-form-urlencoded" https://localhost:9443/oauth2/token
```

                basic_auth='%s:%s' % (self.cid, self.csec))['authorization']

            response = self._http.urlopen('POST', self.idp_ep,
                                          body="grant_type=client_credentials",
                                          headers=headers,
                                          preload_content=True,
                                          )
            if response.status != 200:

	flag.StringVar(&clientSecret, "csec", "", "Client secret")
}

func getTokenExpiry() (*credentials.ClientGrantsToken, error) {
	data := url.Values{}
	data.Set("grant_type", "client_credentials")
	req, err := http.NewRequest(http.MethodPost, idpEndpoint, strings.NewReader(data.Encode()))
	if err != nil {
		return nil, err
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

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
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

After that, you will be able to obtain an id_token for the Admin REST API using client_id and client_secret:

```
curl \
  -d "client_id=<YOUR_CLIENT_ID>" \
  -d "client_secret=<YOUR_CLIENT_SECRET>" \
  -d "grant_type=client_credentials" \
  "http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token"
```

    * 🇺🇸🔍 🔰 🤝.
    * 🇺🇸🔍 📰, ♒️.
* `oauth2`: 🌐 Oauth2️⃣ 🌌 🍵 💂‍♂ (🤙 "💧").
    * 📚 👫 💧 ☑ 🏗 ✳ 2️⃣.0️⃣ 🤝 🐕‍🦺 (💖 🇺🇸🔍, 👱📔, 👱📔, 📂, ♒️):
        * `implicit`
        * `clientCredentials`
        * `authorizationCode`
    * ✋️ 📤 1️⃣ 🎯 "💧" 👈 💪 👌 ⚙️ 🚚 🤝 🎏 🈸 🔗:
        * `password`: ⏭ 📃 🔜 📔 🖼 👉.
* `openIdConnect`: ✔️ 🌌 🔬 ❔ 🔎 Oauth2️⃣ 🤝 📊 🔁.
    * 👉 🏧 🔍 ⚫️❔ 🔬 👩‍💻 🔗 🔧.

    * Vários desses fluxos são apropriados para construir um provedor de autenticação OAuth2 (como Google, Facebook, Twitter, GitHub, etc):
        * `implicit`
        * `clientCredentials`
        * `authorizationCode`
    * Mas existe um “fluxo” específico que pode ser perfeitamente usado para resolver autenticação diretamente na mesma aplicação:

    * Некоторые из этих "потоков" подходят для реализации аутентификации через сторонний сервис использующий OAuth 2.0 (например, Google, Facebook, Twitter, GitHub и т.д.):
        * `implicit`
        * `clientCredentials`
        * `authorizationCode`
    * Но есть один конкретный "поток", который может быть идеально использован для обработки аутентификации непосредственно в том же приложении:

        if (logger.isDebugEnabled()) {
            logger.debug("authCode: {}, authority: {}, uri: {}", authCode, authority, currentUri);
        }
        final ClientCredential credential = new ClientCredential(getClientId(), getClientSecret());
        ExecutorService service = null;
        try {
            service = Executors.newFixedThreadPool(1);

    * HTTP Basic 认证方式。
    * HTTP Digest，等等。
* `oauth2`：所有的 OAuth2 处理安全性的方式（称为「流程」）。
    *以下几种流程适合构建 OAuth 2.0 身份认证的提供者（例如 Google，Facebook，Twitter，GitHub 等）：
        * `implicit`
        * `clientCredentials`
        * `authorizationCode`
    * 但是有一个特定的「流程」可以完美地用于直接在同一应用程序中处理身份认证：
        * `password`：接下来的几章将介绍它的示例。
* `openIdConnect`：提供了一种定义如何自动发现 OAuth2 身份认证数据的方法。
    * 此自动发现机制是 OpenID Connect 规范中定义的内容。