///

## Sub Aplicaciones { #sub-applications }

	public final fun -deprecated_localCertificates ()Ljava/util/List;
	public final fun -deprecated_localPrincipal ()Ljava/security/Principal;
	public final fun -deprecated_peerCertificates ()Ljava/util/List;
	public final fun -deprecated_peerPrincipal ()Ljava/security/Principal;
	public final fun -deprecated_tlsVersion ()Lokhttp3/TlsVersion;
	public final fun cipherSuite ()Lokhttp3/CipherSuite;

Isso, somado ao simples fato que Python é a principal linguagem para **Data Science**, Aprendizado de Máquina e especialmente Deep Learning, faz do FastAPI uma ótima escolha para APIs web e aplicações com Data Science / Aprendizado de Máquina (entre muitas outras).

            return null;
        }

        @Override
        public boolean isUserInRole(String role) {
            return false;
        }

        @Override
        public java.security.Principal getUserPrincipal() {
            return null;
        }

        @Override
        public String getRequestedSessionId() {
            return null;
        }

        @Override

         * hostname because apparently some servers do not respond
         * anymore. I think everyone post Windows 98 will accept
         * an IP address as the tconHostName which is the principal
         * use of this method.
         */
        if (this.hostName.isUnknown()) {
            return getHostAddress();
        }
        return this.hostName.name;
    }

    @Override

        return this.masterKey;
    }

    @Override
    public String getNetbiosName() {
        return this.netbiosName;
    }

    /**
     * Sets the target server's Service Principal Name (SPN).
     * @param targetName
     *            the target's SPN
     */
    public void setTargetName(final String targetName) {
        this.targetName = targetName;
    }

    @Override

{* ../../docs_src/settings/app02_an_py310/config.py hl[10] *}

Perceba que agora não criamos uma instância padrão `settings = Settings()`.

### O arquivo principal da aplicação { #the-main-app-file }

Agora criamos uma dependência que retorna um novo `config.Settings()`.

{* ../../docs_src/settings/app02_an_py310/main.py hl[6,12:13] *}

/// tip | Dica

     * @param providerUrl The provider URL.
     * @param principal The principal.
     * @param credntials The credentials.
     * @return The environment for LDAP connection.
     */
    protected Hashtable<String, String> createEnvironment(final String initialContextFactory, final String securityAuthentication,
            final String providerUrl, final String principal, final String credntials) {

* Validación de datos
* Anotación de API y documentación automática

Y solo tienes que declararlos una vez.

     * }
     * The {@code Principal} object returned will never be {@code null}
     * however the username can be {@code null} indication anonymous
     * credentials were used (e.g. some IPC$ services).
     */

    /**
     * Returns the principal used for authentication
     *
     * @return the authentication principal
     */
    public Principal getPrincipal() {
        return auth;