### Requerido, puede ser `None` { #required-can-be-none }

Puedes declarar que un parámetro puede aceptar `None`, pero que aún así es requerido. Esto obligaría a los clientes a enviar un valor, incluso si el valor es `None`.

Para hacer eso, puedes declarar que `None` es un tipo válido pero simplemente no declarar un valor por defecto:

  /** Returns this address's certificate pinner, or null if this is not an HTTPS address. */
  @get:JvmName("certificatePinner") val certificatePinner: CertificatePinner?,
  /** Returns the client's proxy authenticator. */
  @get:JvmName("proxyAuthenticator") val proxyAuthenticator: Authenticator,
  /**
   * Returns this address's explicitly-specified HTTP proxy, or null to delegate to the

* **Veriyi dönüştürmek**: request'ten gerekli tipe.
* **Veriyi doğrulamak**: her request'ten gelen veriyi:
    * Veri geçersiz olduğunda client'a dönen **otomatik hatalar** üretmek.
* OpenAPI kullanarak API'yi **dokümante etmek**:
    * bu, daha sonra otomatik etkileşimli dokümantasyon kullanıcı arayüzleri tarafından kullanılır.

## Resumen { #recap }

Ahora puedes obtener el usuario actual directamente en tu *path operation function*.

Ya estamos a mitad de camino.

Solo necesitamos agregar una *path operation* para que el usuario/cliente envíe realmente el `username` y `password`.

Если вам нужно это строгое требование, используйте `OAuth2PasswordRequestFormStrict` вместо `OAuth2PasswordRequestForm`.
///

* Необязательное поле `client_id` (в нашем примере оно не нужно).
* Необязательное поле `client_secret` (в нашем примере оно не нужно).

/// info | Дополнительная информация

Bir client'ten (örneğin bir tarayıcıdan) API'nize veri göndermeniz gerektiğinde, bunu **request body** olarak gönderirsiniz.

Bir **request** body, client'in API'nize gönderdiği veridir. Bir **response** body ise API'nizin client'e gönderdiği veridir.

Wenn Sie es erzwingen müssen, verwenden Sie `OAuth2PasswordRequestFormStrict` anstelle von `OAuth2PasswordRequestForm`.

///

* Eine optionale `client_id` (benötigen wir für unser Beispiel nicht).
* Ein optionales `client_secret` (benötigen wir für unser Beispiel nicht).

/// info | Info

If you need to enforce it, use `OAuth2PasswordRequestFormStrict` instead of `OAuth2PasswordRequestForm`.

///

* An optional `client_id` (we don't need it for our example).
* An optional `client_secret` (we don't need it for our example).

/// info

The `OAuth2PasswordRequestForm` is not a special class for **FastAPI** as is `OAuth2PasswordBearer`.

mc admin config get myminio identity_openid
identity_openid config_url=https://accounts.google.com/.well-known/openid-configuration client_id=843351d4-1080-11ea-aa20-271ecba3924a
```

Testing with an example
> Visit [Google Developer Console](https://console.cloud.google.com) under Project, APIs, Credentials to get your OAuth2 client credentials. Add `http://localhost:8080/oauth2/callback` as a valid OAuth2 Redirect URL.

```

        try {
            final RESULT result = entityType.newInstance();
            result.setAccessType(DfTypeUtil.toString(source.get("accessType")));
            result.setClientIp(DfTypeUtil.toString(source.get("clientIp")));
            result.setHitCount(DfTypeUtil.toLong(source.get("hitCount")));
            result.setHitCountRelation(DfTypeUtil.toString(source.get("hitCountRelation")));