@Override
        public com.yahoo.processing.Response process(com.yahoo.processing.Request request, Execution execution) {
            com.yahoo.processing.Response response = execution.process(request);
            response.data().add(new ResponseHeaders(responseHeaders, request));
            return response;
        }
Adds a set of headers to every passing response
container-core/src/test/java/com/yahoo/processing/handler/ProcessingHandlerTestCase.java