final String widthStr = req.getParameter(SCREEN_WIDTH);
            if (StringUtil.isNotBlank(widthStr)) {
                final int width = Integer.parseInt(widthStr);
                updateHighlightInfo(highlightInfo, width);
                final HttpSession session = req.getSession(false);
                if (session != null) {
                    session.setAttribute(SCREEN_WIDTH, width);
                }
            } else {