Newbie question. Can't receive data from server.

Hello. I'm newbe in GWT and I have never studied java before. I want
to receive data from server in json format. I defined a button and
onClick for it:

public void onClick(ClickEvent event) {
Window.alert("Let's see....");
RequestBuilder reqbuilder = new
RequestBuilder(RequestBuilder.GET,com.google.gwt.http.client.URL.encode("http://
uits-group.ru/media/search-results.js"));

try {
reqbuilder.sendRequest(null, new RequestCallback() {
public void onResponseReceived(Request request, Response
response) {
Window.alert(response.getStatusCode()+"");
}

@Override
public void onError(Request request, Throwable t) {
Window.alert("Error!");

}

}

);
} catch (RequestException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Window.alert("Exception!");
}
}

StatusCode is always 0 and getResponseText() always return nothing.
What I'm doing wrong? At the specified url adress is placed .js file
with text in json, as in example JSON with GWT package. I want to
receive the text in a .js file instead of nothing. Thanks for help.

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