Cordova / phonegap & node.js : XMLHttpRequest returns status 0

I've written an HTTP server in node.js

var http = require('http');
http.createServer(function (request, response) {
  response.writeHead(200, {'Content-Type': 'text/plain'});
  response.end('Hello World ' + request.url + '\n\n');
  console.log(request.url);
}).listen(8124);
console.log('Server running at http://127.0.0.1:8124/');

That should serve requests from a phonegap / cordova app:

function testnodejs() {
    xmlHttp=GetXmlHttpObject()
    if (xmlHttp==null)  {
        alert ("Your webbrowser does not support HTTP Request");
        return;
    }
    var url="http://domain.com:8124/i.t?hi=hi!";
    console.log(url);
    document.getElementById("maindiv").innerHTML = "<div id='itembrd' onClick=\"testnodejs();\"><div id='item'>Nodetest</div></div>";
    xmlHttp.open("GET", url, true)
xmlHttp.onreadystatechange=function() {
        document.getElementById("maindiv").innerHTML += xmlHttp.status + " ";
        if (xmlHttp.readyState==4) {
            console.log(xmlHttp.responseText);
            document.getElementById("maindiv").innerHTML += xmlHttp.responseText + '<br />\n';
        }
    }
    xmlHttp.send(null)
}

In config.xml I have

<access origin=".*" />

The request returns a readyState 4 but also a status of 0 when you'd expect a 200. Anyone have a clue?