## Funcionalidades adicionales { #additional-features }

El [Tutorial - Guía del usuario](../tutorial/index.md){.internal-link target=_blank} principal debería ser suficiente para darte un recorrido por todas las funcionalidades principales de **FastAPI**.

En las siguientes secciones verás otras opciones, configuraciones y funcionalidades adicionales.

/// tip | Consejo

package jcifs.http;

import java.security.Principal;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletRequestWrapper;

class NtlmHttpServletRequest extends HttpServletRequestWrapper {

    Principal principal;

    NtlmHttpServletRequest(final HttpServletRequest req, final Principal principal) {
        super(req);
        this.principal = principal;
    }

    @Override

            // client/caller principal
            final SpnegoPrincipal principal;
            try {
                principal = getAuthenticator().authenticate(request, spnegoResponse);
                if (logger.isDebugEnabled()) {
                    logger.debug("principal={}", principal);
                }
            } catch (final Exception e) {

package jcifs.smb1.http;

import java.security.Principal;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletRequestWrapper;

class NtlmHttpServletRequest extends HttpServletRequestWrapper {

    Principal principal;

    NtlmHttpServletRequest(final HttpServletRequest req, final Principal principal) {
        super(req);
        this.principal = principal;
    }

    @Override

    }

    /**
     * Test method for {@link NtlmHttpServletRequest#getUserPrincipal()}.
     * Verifies that the method returns the correct principal object.
     */
    @Test
    void testGetUserPrincipal() {
        // Act: Call the method under test
        Principal actualPrincipal = ntlmRequest.getUserPrincipal();

    @Test
    @DisplayName("constructor accepts null principal")
    void testConstructorWithNullPrincipal(@Mock HttpServletRequest mockRequest) {
        // Constructor accepts null principal without throwing exception
        NtlmHttpServletRequest request = new NtlmHttpServletRequest(mockRequest, null);

        // getRemoteUser() will throw NPE when trying to call getName() on null principal

                        final UserPrincipal principal = acl.principal();
                        if (logger.isDebugEnabled()) {
                            logger.debug("Principal: [{}] {}", principal.getClass().getName(), principal);
                        }
                        if (principal instanceof final GroupPrincipal groupPrincipal) {

                throw new PACDecodingException("Unrecognized field " + tagged.getTagNo());
            }
        }

    }

    /**
     * Returns the user principal name from the ticket.
     *
     * @return the user principal name
     */
    public String getUserPrincipalName() {
        return this.encData.getUserPrincipalName();
    }

    /**
     * Returns the user realm from the ticket.

  val localPrincipal: Principal?
    get() = (localCertificates.firstOrNull() as? X509Certificate)?.subjectX500Principal

  @JvmName("-deprecated_localPrincipal")
  @Deprecated(
    message = "moved to val",
    replaceWith = ReplaceWith(expression = "localPrincipal"),
    level = DeprecationLevel.ERROR,
  )
  fun localPrincipal(): Principal? = localPrincipal

  override fun equals(other: Any?): Boolean =

# Sub Aplicaciones - Mounts { #sub-applications-mounts }

Si necesitas tener dos aplicaciones de **FastAPI** independientes, cada una con su propio OpenAPI independiente y su propia interfaz de docs, puedes tener una aplicación principal y "montar" una (o más) sub-aplicación(es).

## Montar una aplicación **FastAPI** { #mounting-a-fastapi-application }