GWT cross-site request

Hi folks,

I have a webservice that returns a JSONP. The URL of the webservice is this:

http://user:password@localhost:8080/project/api/clientByEmail?email=user@domain.com&callback=callback1

The result of that URL is this:

callback1({"personId":"1","email":"user@domain.com","password":"5f4dcc3b5aa765d61d8327deb882cf99","personType":"1","documentNumber":"00000000191","fullName":"Name Middle Last","phone":"4130232076","mobile":"4191199614","active":"true"})

I'm writting a GWT form to retrieve this information from my webservice. I have the following function, copied from GWT Tutorial, to do that:

    public native static void getClientJson(String url, GwtTest handler) /*-{
        // [1] The script starts by setting up a <script> element. The src attribute points to the URL that will retrieve the JSON data wrapped in a callback function.
        script.setAttribute("src", url);
        script.setAttribute("type", "text/javascript");
   
        // [2] The callback function is defined on the browser's window object. It receives as an argument a JavaScript object which is the JSON data returned by the server.
        window[callback] = function(jsonObj) {
            // [3] The callback function passes the JSON data as a JavaScript object to the Java method, handleJsonResponse.
            handler.@com.google.gwt.gwttest.client.GwtTest::handleJsonResponse(Lcom/google/gwt/core/client/JavaScriptObject;)(jsonObj);
            window[callback + "done"] = true;
        }
   
        // [4] A timeout function is defined to check for an unresponsive server or network problem; it checks a flag to see if the JSON callback was ever called.
        setTimeout(function() {
            if (!window[callback + "done"]) {
                handler.@com.google.gwt.gwttest.client.GwtTest::handleJsonResponse(Lcom/google/gwt/core/client/JavaScriptObject;)(null);
            }
   
             // [5] Before the timeout function completes, it removes the new <script> element and the callback function from window.
             document.body.removeChild(script);
             delete window[callback];
             delete window[callback + "done"];
        }, 1000);
       
        // [6] Finally call appendChild() to attach the dynamically-loaded <script> element to the HTML document body. This causes the web browser to download the JavaScript referenced by the src attribute.
        document.body.appendChild(script);
    }-*/;

The problem is that when I execute this function, I always get this error message:

(ReferenceError) @com.google.gwt.gwttest.client.GwtTest::getClientJson(Ljava/lang/String;Lcom/google/gwt/gwttest/client/GwtTest;)([string: 'http://user:password@localhost:8080/project/api/clientByEmail?email=user@domain.com&callback=callback1', Java object: com.google.gwt.gwttest.client.GwtTest@8723626]): script is not defined

What am I doing wrong? When I past that URL on Chrome, or any other browser, it works just fine.

Thanks in advance.

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