}

        @Override
        public String getRequestURI() {
            throw new UnsupportedOperationException();
        }

        @Override
        public StringBuffer getRequestURL() {
            throw new UnsupportedOperationException();
        }

        @Override
        public String getServletPath() {
            throw new UnsupportedOperationException();
        }

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