JsonpRequestBuilder requestString() - does it work?

Hi,

I've got an example of JsonpRequestBuilder.send() working - but this requires us to provide an overlay type in the callback:

    new AsyncCallback<MyOverlayType>() {

        public void onSuccess(MyOverlayType result) {

        }

    }

Is there a way to instead get the raw String result from the remote server, before it gets translated into a JSON object? Something like:

    new AsyncCallback<String>() {

        public void onSuccess(String result) {

            println("Raw response from remote server is: " + result);

        }

    }

I thought maybe:

    JsonpRequestBuilder.requestString();

might do that, but doesn't seem to. In firefox, I get an error when trying that approach:

    uncaught exception: java.lang.ClassCastException

        null.a();

Thanks

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