code: @PostMapping(path = SamlProtocolConstants.ENDPOINT_SAML_VALIDATE)
      @Override
      public ModelAndView handleRequestInternal(final HttpServletRequest request,
                                                final HttpServletResponse response) throws Exception {
          return super.handleRequestInternal(request, response);
      }
docs: Handle model and view.
  
  @param request  the request
  @param response the response
  @return the model and view
  @throws Exception the exception