private HttpResponse getHttpResponse(Response processingResponse) {
            int status = 200; // true status is determined asynchronously in ProcessingResponse.complete()
            return new ProcessingResponse(status, request, processingResponse, getRenderer(), renderingExecutor, execution);
        }
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