Cordova, cross-domain ajax works but not in a web worker

[jure]

My config.xml has the "Domain Access" set to "*". I don't have the possibility to change remote server's headers (it's an hardware device). My cross-domain XMLHttpRequest calls works well. But if i make the same calls in a web worker (created with the blob technique) they don't work anymore! Why? Is there a workaround? Thanks!

I'm using this function (i'm not sure about the headers, i think they should stay in the server's response, not in the client request):

myapp.ajax=function(){

var o = arguments[0]||{},

url = o.url||null,

cache = o.cache||true,

timeout = o.timeout||0,

callback = arguments[1]||function(){}

;

if(!url)return null;

var myRequest = new XMLHttpRequest();

myRequest.timeout = timeout;

var urlToCall=url;

if(!cache){

urlToCall += urlToCall.indexOf('?')==-1 ? '?' : '&' ;

urlToCall += '_=' + Date.now() ;

}

myRequest.onreadystatechange=function() {

if (myRequest.readyState == 4) {

if (myRequest.status == 200) {

callback(myRequest.responseText,'success',myRequest);

} else {

callback(myRequest,'error',myRequest.statusText);

}

}

}

myRequest.open("GET",urlToCall,true);

myRequest.setRequestHeader("Access-Control-Allow-Origin", "*");

myRequest.setRequestHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

myRequest.setRequestHeader("Access-Control-Allow-Methods","POST, GET, OPTIONS, DELETE, PUT, HEAD");

myRequest.send(null);

}