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Titanium createHTTPClient cannot be running ?

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this url can be as below:

[
   {"title": "test 1"}, 
   {"title": "test 2"}
]
var url = "http://test.com/getNews.php"; // it's fake url 
var xhr = Ti.Network.createHTTPClient();
xhr.open("GET", url);
xhr.onload = function() {
 
    var json = JSON.parse(xhr.responseText);
 
    Ti.API.info(json);
 
    for(var i = 0; i < json.length; i++) {
        var title = json[i].title;
        var tableViewRow = createTableViewRow();
        var imageView = createImageView(title);
 
        tableViewRow.add(imageView);
        $.section.add(tableViewRow);
 
        Ti.API.info(title, tableViewRow);
    }
 
 
}; 
 
xhr.send();
and two function as
function createView(text) {
    return PHD.UI.createPHDView({
        text: text
    });
}  
 
function createTableViewRow() {
    return Ti.UI.createTableViewRow({
        hasChild: true      
    });
}
if code and not xhr.onload but can be use fine
var tableViewRow = createTableViewRow();
    var imageView = createView('test 1');
 
    tableViewRow.add(imageView);
    $.section.add(tableViewRow);
i use HTTPClient , but can not show me the result ?

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