UserShare.java

 @RequestMapping("/socialshare")
    void handleUpdate(HttpServletResponse response,@RequestHeader("User-Agent") String os) throws IOException {

        System.out.println(os);

        if (Pattern.compile(Pattern.quote("Android"), Pattern.CASE_INSENSITIVE).matcher(os).find())
            response.sendRedirect("https://play.google.com/store/apps/details?id=com.rezgcorp.powerworld&hl=en");
        else if (Pattern.compile(Pattern.quote("iPhone"), Pattern.CASE_INSENSITIVE).matcher(os).find()) {
            response.sendRedirect("https://apps.apple.com/us/app/power-world-access-app/id1514909558");
        } else {
            response.sendRedirect("https://play.google.com/store/apps/details?id=com.rezgcorp.powerworld&hl=en");
        }
    }