GWT HTTP GET function

[Andy]

public void doGet(String myurl) {

        myurl = URL.encode(myurl);

        RequestBuilder builder = new
RequestBuilder(RequestBuilder.GET, myurl );

        try {
          Request request = builder.sendRequest(null, new
RequestCallback() {
            public void onError(Request request, Throwable exception)
{
                Window.alert("ERROR. Could not connect to server.");
            }

            public void onResponseReceived(Request request, Response
response) {
              if (200 == response.getStatusCode()) {
                 String ServerResponse = response.getText();

              } else {
                  Window.alert("ERROR. Errorcode: " +
response.getStatusCode());
              }
            }
          });

How can i make this function return SereverResponce variable?

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