@Override public LowLevelHttpRequest buildRequest(String method, String url) throws IOException { errorInfo.setFactory(jsonFactory); GoogleJsonError jsonError = new GoogleJsonError(); jsonError.setCode(status); jsonError.setErrors(Collections.singletonList(errorInfo)); jsonError.setMessage(httpStatusString); jsonError.setFactory(jsonFactory); GenericJson errorResponse = new GenericJson(); errorResponse.set("error", jsonError); errorResponse.setFactory(jsonFactory); return new MockLowLevelHttpRequest() .setResponse( new MockLowLevelHttpResponse() .setContent(errorResponse.toPrettyString()) .setContentType(Json.MEDIA_TYPE) .setStatusCode(status)); } };