Jon means that the response status should be 412...
var req = this.getTransport();
req.open('POST', uri, true);
req.onreadystatechange = function (aEvt) {
if (req.readyState == 4) {
if(req.status == 200)
var r = eval(req.responseText);
if(req.status == 412)
alert("error has occured: " + req.responseText);
}
}
Felix
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