Map<String,String> headers = new HashMap<>();
headers.put("param1", "value1");
Method method = new Resource(url, headers).get();
method.send(...);
should do the same as in your examples. if only your TRICK works
please file a bug sowe can track it down.
regards, Kristian
https://github.com/chirino/resty-gwt/issues
thanx, Kristian