AppserverIo\Appserver\ServletEngine\Authenticator\FormAuthenticator::forwardToFormRequest PHP Method

    protected function forwardToFormRequest(HttpServletRequestInterface $servletRequest, HttpServletResponseInterface $servletResponse)
    {
        // load the session from the request
        $session = $servletRequest->getSession();
        // initialize the location to redirect to
        $location = '/';
        // prepend the base modifier if available
        if ($baseModifier = $servletRequest->getBaseModifier()) {
            $location = $baseModifier;
        }
        // query whether or not we found the original request to redirect to
        if ($session && $session->hasKey(Constants::FORM_REQUEST)) {
            // load the original request
            $req = $session->getData(Constants::FORM_REQUEST);
            // initialize the location to redirect to
            $location = $req->requestUri;
            // prepare URI + query string to redirect to
            if ($queryString = $req->queryString) {
                $location .= '?' . $queryString;
            }
        }
        // redirect to the original location
        $servletRequest->setDispatched(true);
        $servletResponse->setStatusCode(303);
        $servletResponse->addHeader(Protocol::HEADER_LOCATION, $location);
    }