QML XMLHttpRequest often failed when using WIFI

            var mycontent = "username=nametest&password=onlyfortees";
            var myhttptemp = new XMLHttpRequest();
            var loginUrl = "http://192.168.1.11/testserver/login";
            myhttptemp.open("POST", loginUrl, false); 
            myhttptemp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
            myhttptemp.setRequestHeader("Content-length", mycontent.length);
            myhttptemp.setRequestHeader("Connection", "Keep-Alive");
            myhttptemp.send(mycontent);
            if(myhttptemp.status === 200)
            {
                console.log("myhttptemp===========");     //wired network
            }
            else
            {
                console.log("failed");    //wireless network  myhttptemp.status is 0  
            }