[TIMOB-24649] iOS: UI blocked + Network Indicator invisible during synchronous HTTP-Requests with run-on-main-thread

var win = Ti.UI.createWindow({
    backgroundColor: '#fff'
});
 
var btn = Ti.UI.createButton({
    title: 'Trigger'
});
 
btn.addEventListener('click', function() {
    var url = "https://httpbin.org/delay/2";
    var client = Ti.Network.createHTTPClient({
        // function called when the response data is available
        onload : function(e) {
            Ti.API.info("Received text: " + this.responseText);
            alert('success');
        },
        // function called when an error occurs, including a timeout
        onerror : function(e) {
            Ti.API.debug(e.error);
            alert('error');
        },
        async: false,
        timeout : 15000  // in milliseconds
    });
    // Prepare the connection.
    client.open("GET", url);
    // Send the request.
    client.send();
});
 
win.add(btn);
win.open();