docs: protected String buildRedirectUrlByRequestedAuthnContext(final String initialUrl, final AuthnRequest authnRequest, final HttpServletRequest request) {
          val authenticationContextClassMappings = samlProfileHandlerConfigurationContext.getCasProperties()
              .getAuthn().getSamlIdp().getAuthenticationContextClassMappings();
          if (authnRequest.getRequestedAuthnContext() == null || authenticationContextClassMappings == null || authenticationContextClassMappings.isEmpty()) {
              return initialUrl;
          }
  
          val mappings = getAuthenticationContextMappings();
  
          val p =
              authnRequest.getRequestedAuthnContext().getAuthnContextClassRefs()
                  .stream()
                  .filter(ref -> {
                      val clazz = ref.getAuthnContextClassRef();
                      return mappings.containsKey(clazz);
                  })
                  .findFirst();
  
          if (p.isPresent()) {
              val mappedClazz = mappings.get(p.get().getAuthnContextClassRef());
              return initialUrl + '&' + samlProfileHandlerConfigurationContext.getCasProperties()
                  .getAuthn().getMfa().getRequestParameter() + '=' + mappedClazz;
          }
  
          return initialUrl;
      }