[TIMOB-6016] iOS: Http request sent twice on ios 5

var xhr = Ti.Network.createHTTPClient();
xhr.setTimeout(10000);

var win = Ti.UI.createWindow({
    backgroundColor: "#fff",
    height: "100%",
    width: "100%"
}),
top = Ti.UI.createTextArea({
    borderWidth: 1,
    left: 0,
    top: 0,
    height: 300,
    width: "100%",
    value: ""
}),
bottom = Ti.UI.createTextArea({
    borderWidth: 1,
    left: 0,
    bottom: 0,
    height: 300,
    width: "100%",
    value: ""
}),
btn = Ti.UI.createButton({
    height: 100,
    width: 300,
    right: 20,
    title: "make call"
}),
stats = Ti.UI.createLabel({
    left: 20,
    height: 200,
    width: "auto",
    text: ""
}),
data = {
    clicked: 0,
    success: 0,
    dupe: 0,
    ratio: 0,
    events: 0,
    calls: 0
};

win.add(top);
win.add(stats);
win.add(btn);
win.add(bottom);
win.open();

function callback(data) {    
    var msg;
    if (data.success) {
        msg = "Success";
        record("success", true);
    } else if (!data.success && data.error && data.error == "duplicate request") {
        msg = "Error: duplicate request";
        record("dupe", true);
    } else
        msg = "Error: Unknown\ndata: " + JSON.stringify(data);
        
    top.value += data.auth + ": " + msg + "\n";
}
Ti.App.addEventListener("events/detail", callback);
    
btn.addEventListener("click", function(e) {
    bottom.value += "call()\n";
    record("events");
    record("clicked");
    
    call("POST", "events/detail", {
        eventId: 1,
        longitude: -105.24097442626953,
        latitude: 39.97970199584961,
        appId: 1
    });
});

function call(method, uri, data) {
    Ti.API.info("Network ready state: " + xhr.readyState);

    var base = "http://dev.mobilestudying.com:8080";
    var _uri = "/examjam-1.0/" + uri;
    var timestamp = new Date().getTime();
    var contentType = "application/x-www-form-urlencoded";
    var secret = "88627d4c72a611e09f3efb27cf9a9621";
    var hash = [method, _uri.split("?", 1)[0], contentType, timestamp, secret];
    var auth = Ti.Utils.md5HexDigest(hash.join("\n"));
    
    xhr.onload = function() {
        var data = this.responseText ? JSON.parse(this.responseText) : null;
        data.auth = auth;
        //Ti.API.info("data: " + JSON.stringify(data));
        Ti.App.fireEvent(uri.split("?")[0], data);
    };
    xhr.onerror = function(){
        Ti.API.debug("ERROR: Call failed to '" + uri + "': " + this.responseText);
        Ti.API.debug("ERROR: data: " + JSON.stringify(this.responseData));
        Ti.API.debug("ERROR: status code: " + this.status);
    };

    xhr.open(method, base + _uri);
    xhr.setRequestHeader("Content-Type", contentType);
    xhr.setRequestHeader("X-ExamJam-APIKey", "b95a0551553ae446fa39b95f8ffbac26");
    xhr.setRequestHeader("Date", timestamp);
    xhr.setRequestHeader("Authorization", auth);
   
    bottom.value += "send()\n"; 
    record("calls");
    
    xhr.send(data);
}
function record(value, display) {
    data[value]++;
    
    if (display) {
        stats.text = "Clicked (events/calls): " + data.clicked + " (" + data.events + "/" + data.calls + ")";
        stats.text += "\nSuccess: " + data.success;
        stats.text += "\nDupe (ratio): " + data.dupe + " (" + ((data.dupe / data.success) * 100) + "%)";
    }
}