GET and POST special characters to server - Appcelerator Titanium

app.js

//How to GET and POST special characters to server

var win=Titanium.UI.createWindow({
	backgroundColor:'#fff'
});

var lbl = Titanium.UI.createLabel({
  top:10,
  width:300,
  left:10,
  height:'auto'
});
win.add(lbl);

// XHR GET
var xhr = Titanium.Network.createHTTPClient();
xhr.onload = function()
{
  Ti.API.info('in utf-8 onload for GET');
  lbl.text = this.responseText;
};
xhr.onerror = function()
{
  Ti.API.info('in utf-8 error for GET');
};
xhr.open("GET","http://api.appcelerator.net/p/v1/echo");
//xhr.open("POST","http://api.appcelerator.net/p/v1/echo");
xhr.send({"a":"€漢字Ãéè"});

win.open();