/*
                 * Server challenge no longer valid for
                 * externally supplied password hashes.
                 */
                resp.sendRedirect(req.getRequestURL().toString());
                return;
            }
            resp.setHeader("WWW-Authenticate", "NTLM");
            if (offerBasic) {

                /* Server challenge no longer valid for
                 * externally supplied password hashes.
                 */
                resp.sendRedirect(req.getRequestURL().toString());
                return;
            }
            resp.setHeader("WWW-Authenticate", "NTLM");
            if (offerBasic) {

     * @return The login credential or null if processing fails.
     */
    protected LoginCredential processAuthenticationData(final HttpServletRequest request) {
        final StringBuilder urlBuf = new StringBuilder(request.getRequestURL());
        final String queryStr = request.getQueryString();
        if (queryStr != null) {
            urlBuf.append('?').append(queryStr);
        }