CRAWLING_ACCESS_EXCEPTION, //
    CRAWLING_EXCETPION, //
    NO_URL_IN_QUEUE, //
    START_THREAD, //
    FINISHED_THREAD, //
    NO_RESPONSE_PROCESSOR, //
    NO_RULE, //
    SYSTEM_ERROR

    }

    @Override
    public OptionalThing<ApiResponse> handleServerException(final ApiFailureResource resource, final Throwable cause) {
        return OptionalThing.of(asJson(createFailureBean(Status.SYSTEM_ERROR, createMessage(resource, cause))));
    }

    // ===================================================================================
    //                                                                        Assist Logic

            break;
        case NO_RESPONSE_PROCESSOR:
            processNoResponseProcessor(objs);
            break;
        case NO_RULE:
            processNoRule(objs);
            break;
        case SYSTEM_ERROR:
            processSystemError(objs);
            break;
        default:
            processDefault(objs);
            break;
        }
    }

    protected ApiResponse response = null;

    public ApiResult(final ApiResponse response) {
        this.response = response;
    }

    public enum Status {
        OK(0), BAD_REQUEST(1), SYSTEM_ERROR(2), UNAUTHORIZED(3), FAILED(9);

        private final int id;

        Status(final int id) {
            this.id = id;
        }

        public int getId() {
            return id;
        }

                    crawlerContext.intervalController.delay(IntervalController.WAIT_NEW_URL);
                }
            }
        } catch (final Throwable t) {
            log(logHelper, LogType.SYSTEM_ERROR, t);
        } finally {
            // remove crawlerContext from thread
            CrawlingParameterUtil.setCrawlerContext(null);
            CrawlingParameterUtil.setUrlQueueService(null);