Hbuilder app开发，使用mui.ajax和服务器交互，后台获取不到值，显示null的解决方法

function login() {
var uname=document.getElementById("username").value.trim();
var pwd=document.getElementById("password").value.trim();
mui.toast("0 "+uname+" "+pwd); mui.ajax(
'http://192.168.63.2:8080/ServletTest/servlet/AjaxTest',{
data: {
uname:uname,
pwd:pwd
},
dataType: 'text',
type: 'post',
timeout: 10000,
headers: {
'Content-Type': 'application/x-www-form-urlencoded'
},
success: function(data) {
mui.toast("success "+data);
},
error: function(xhr, type, errorThrown) {
mui.toast("error "+type);
console.log(xhr,type,errorThrown);
}
});
}