I try the following request in Titanium

```
var xhr = Titanium.Network.createHTTPClient();
xhr.open("POST", "http://www.example.com");
var params = {
    username = "username",
    password = "password"
};
xhr.send(params);

```

The problem is that it works in iPhone Simulator, but not on the android emulator/device
The request comes through to the server, but if I print the params in my php page, they are both empty.