java中HttpServletRequest能獲得安卓或IOS或web（微信瀏覽器）訪問嗎？

@RequestMapping(value ="testHttp")
    @ResponseBody
    public int TestHttp(HttpServletRequest httpServletRequest){
        String  browserDetails  =   httpServletRequest.getHeader("User-Agent");
        String  userAgent       =   browserDetails;
        String  user            =   userAgent.toLowerCase();

        String os = "";
        String browser = "";
        //=================OS Info=======================
        if(user.indexOf("android") >= 0){

        }
        else if(user.indexOf("iphone") >= 0)
        {

        }
        return 1;
    }

以上是百度的代碼，事實(shí)上我的user得到的是“ok/http3.0” 并沒有android或iphone啊。是我哪地方做錯(cuò)了嗎？