* @param userName User principal name
     * @param userRealm User realm
     * @return A byte array representing the decrypted data
     * @throws IOException on encoding error
     */
    private byte[] createDecryptedDataBytes(String userName, String userRealm) throws IOException {
        ASN1EncodableVector v = new ASN1EncodableVector();

        // crealm (field 2)

				if i, ok := value.(BeforeCreateInterface); ok {
					called = true
					db.AddError(i.BeforeCreate(tx))
				}
			}
			return called
		})
	}
}

// Create create hook
func Create(config *Config) func(db *gorm.DB) {
	supportReturning := utils.Contains(config.CreateClauses, "RETURNING")

	return func(db *gorm.DB) {
		if db.Error != nil {
			return
		}

  "http://localhost:8080/auth/realms/{realm}/protocol/openid-connect/token"
```

The result will be a JSON document. To invoke the API you need to extract the value of the access_token property. You can then invoke the API by including the value in the Authorization header of requests to the API.

The following example shows how to get the details of the user with `{userid}` from `{realm}` realm:

```
curl \

        realmField.setAccessible(true);
        realmField.set(explorer, realm);

        java.lang.reflect.Field defaultDomainField = NetworkExplorer.class.getDeclaredField("defaultDomain");
        defaultDomainField.setAccessible(true);
        defaultDomainField.set(explorer, null);
    }

    /**
     * Helper method to create a mocked NetworkExplorer instance
     */

///

### Crea un `APIRouter` de callback { #create-a-callback-apirouter }

Primero crea un nuevo `APIRouter` que contendrá uno o más callbacks.

{* ../../docs_src/openapi_callbacks/tutorial001_py310.py hl[1,23] *}

### Crea la *path operation* del callback { #create-the-callback-path-operation }

Para crear la *path operation* del callback usa el mismo `APIRouter` que creaste arriba.

## Crear y Usar Variables de Entorno { #create-and-use-env-vars }

Puedes **crear** y usar variables de entorno en la **shell (terminal)**, sin necesidad de Python:

//// tab | Linux, macOS, Windows Bash

<div class="termy">

```console
// Podrías crear una env var MY_NAME con
$ export MY_NAME="Wade Wilson"

        self.scheme_name = scheme_name or self.__class__.__name__
        self.realm = realm
        self.auto_error = auto_error

    def make_authenticate_headers(self) -> dict[str, str]:
        if self.realm:
            return {"WWW-Authenticate": f'Basic realm="{self.realm}"'}
        return {"WWW-Authenticate": "Basic"}

    async def __call__(  # type: ignore

    private Configuration configuration;

    /**
     * Create an authenticator using the JAAS service <code>jcifs</code>
     *
     * This will require that a keytab is configured in this service.
     *
     *
     */
    public JAASAuthenticator() {
        this("jcifs");
    }

    /**
     * Create an authenticator using the given JAAS service
     *

    /**
     * The port number for the web authentication.
     */
    @Min(value = 0)
    @Max(value = 2147483647)
    @ValidateTypeFailure
    public Integer port;

    /**
     * The authentication realm.
     */
    @Size(max = 100)
    public String authRealm;

    /**
     * The protocol scheme (http, https).
     */
    @Size(max = 10)
    public String protocolScheme;

    /**

Veamos cómo hacer uso de una subclase personalizada de `Request` para descomprimir requests gzip.

Y una subclase de `APIRoute` para usar esa clase de request personalizada.

### Crear una clase personalizada `GzipRequest` { #create-a-custom-gziprequest-class }

/// tip | Consejo