@Override
        public void run() {
            if (execution == null || response == null)
                throw new NullPointerException("Uninitialized freeze listener");

            if (channel instanceof LazyContentChannel)
                ((LazyContentChannel)channel).setHttpResponse(getHttpResponse(response));

            // Render if we have a renderer capable of it
            if (getRenderer() instanceof AsynchronousSectionedRenderer) {
                ((AsynchronousSectionedRenderer) getRenderer()).renderResponseBeforeHandover(
                        new ContentChannelOutputStream(channel), response, execution, request);
            }
        }
Returns and lazily creates the http response of this. May be called even if run is never called.
container-core/src/main/java/com/yahoo/processing/handler/AbstractProcessingHandler.java