System.arraycopy(m.doFinal(input), 0, output, 0, 12);
            return output;
        } finally {
            Arrays.fill(dk, 0, dk.length, (byte) 0);
        }
    }

    /**
     * Derives an AES key using the Kerberos key derivation function.
     * This method implements the simplified key derivation for AES encryption types.
     *
     * @param key the base Kerberos key

errors.docid_not_found = ID documento non trovato. Causa: {0}
errors.document_not_found = URL ID documento non trovato. Causa: {0}
errors.not_load_from_server = Impossibile caricare da questo server. Causa: {0}
errors.failed_to_start_job = Impossibile avviare il lavoro {0}.
errors.failed_to_stop_job = Impossibile arrestare il lavoro {0}.
errors.failed_to_download_synonym_file = Impossibile scaricare il file dei sinonimi.

github.com/nats-io/nats-server/v2 v2.8.2/go.mod h1:vIdpKz3OG+DCg4q/xVPdXHoztEyKDWRtykQ4N7hd7C4=
github.com/nats-io/nats-server/v2 v2.11.1 h1:LwdauqMqMNhTxTN3+WFTX6wGDOKntHljgZ+7gL5HCnk=
github.com/nats-io/nats-server/v2 v2.11.1/go.mod h1:leXySghbdtXSUmWem8K9McnJ6xbJOb0t9+NQ5HTRZjI=
github.com/nats-io/nats-streaming-server v0.24.6 h1:iIZXuPSznnYkiy0P3L0AP9zEN9Etp+tITbbX1KKeq4Q=

{* ../../docs_src/query_params_str_validations/tutorial002.py hl[9] *}

Note que substituímos o valor padrão de `None` para `Query(default=None)`, o primeiro parâmetro de `Query` serve para o mesmo propósito: definir o valor padrão do parâmetro.

Então:

```Python
q: Union[str, None] = Query(default=None)
```

...Torna o parâmetro opcional, da mesma maneira que:

```Python

errors.docid_not_found = Dokumenten-ID nicht gefunden. Ursache: {0}
errors.document_not_found = Die URL für die Dokumenten-ID wurde nicht gefunden. Ursache: {0}
errors.not_load_from_server = Konnte von diesem Server nicht geladen werden. Ursache: {0}
errors.failed_to_start_job = Fehler beim Starten eines Jobs: {0}.
errors.failed_to_stop_job = Fehler beim Stoppen eines Jobs: {0}.

Copiez ce code dans un fichier nommé `main.py`.

Démarrez le serveur :

<div class="termy">

```console
$ uvicorn main:app --reload

<span style="color: green;">INFO</span>:     Uvicorn running on http://127.0.0.1:8000 (Press CTRL+C to quit)
<span style="color: green;">INFO</span>:     Started reloader process [28720]
<span style="color: green;">INFO</span>:     Started server process [28722]

Contudo, o cliente ou usuário não terão acesso a ele. Ao contrário, o cliente receberá um "Internal Server Error" com o HTTP status code `500`.

E assim deve ser porque seria um bug no seu código ter o `ValidationError` do Pydantic na sua *response*, ou em qualquer outro lugar do seu código (que não na requisição do cliente).

    os: Os,
    arch: Arch = Arch.AMD64,
) {
    params {
        param("env.BOT_TEAMCITY_GITHUB_TOKEN", "%github.bot-teamcity.token%")
        param("env.GRADLE_CACHE_REMOTE_SERVER", "%gradle.cache.remote.server%")

        param("env.JAVA_HOME", javaHome(buildJvm, os, arch))
        param("env.ANDROID_HOME", os.androidHome)
        param("env.ANDROID_SDK_ROOT", os.androidHome)

 * is used to verify the signature of the "www.squareup.com" certificate.
 *
 * This roles are reversed for client authentication. In that case the client has a private key and
 * a chain of certificates. The server uses a set of trusted root certificates to authenticate the
 * client. Subject alternative names are not used for client authentication.
 */
@Suppress("DEPRECATION")
class HeldCertificate(

    }

    /**
     * Calculates the LMv2 response for NTLM authentication.
     *
     * @param tc the CIFS context
     * @param type2 the Type-2 message containing the server challenge
     * @param domain the domain name
     * @param user the username
     * @param password the user's password
     * @param clientChallenge the client challenge bytes
     * @return the calculated response