// 404
            throw responseManager.new404("Thumbnail for " + form.docId + " is not found.");
        }

        final File thumbnailFile = thumbnailManager.getThumbnailFile(doc);
        if (thumbnailFile == null) {
            if (fessConfig.isThumbnailEnabled()) {
                thumbnailManager.offer(doc);
            }
            // 404

        br.addItem("Advice");
        br.addElement("Against for JVN14876762.");
        br.addElement("Boundary size is limited by Framework.");
        br.addElement("Too long boundary is treated as 404 because it's thought of as attack.");
        br.addElement("");
        br.addElement("While, you can override the boundary limit size");
        br.addElement(" in " + FessMultipartRequestHandler.class.getSimpleName() + ".");

                }
                if (httpStatusCode == 404) {
                    storeChildUrlsToQueue(urlQueue, getAnchorSet(document.get(fessConfig.getIndexFieldAnchor())));
                    if (!indexingHelper.deleteDocument(searchEngineClient, id)) {
                        logger.debug("Failed to delete 404 document: {}", url);
                    }
                    return false;
                }

        }
        final ViewHelper viewHelper = ComponentUtil.getViewHelper();
        try {
            final StreamResponse response = viewHelper.asContentResponse(doc);
            if (response.getHttpStatus().orElse(200) == 404) {
                logger.debug("Not found: {}", targetUrl);
                saveError(messages -> messages.addErrorsNotFoundOnFileSystem(GLOBAL, targetUrl));
                return redirect(ErrorAction.class);
            }

        final ResponseData responseData = client.execute(RequestDataBuilder.newRequestData().get().url(url).build());
        if (responseData.getHttpStatusCode() == 404) {
            response.httpStatus(responseData.getHttpStatusCode());
            CloseableUtil.closeQuietly(responseData);
            return response;
        }
        writeFileName(response, responseData);

            defaultMap.put(FessConfig.CRAWLER_IGNORE_ROBOTS_TAGS, "false");
            defaultMap.put(FessConfig.CRAWLER_IGNORE_CONTENT_EXCEPTION, "true");
            defaultMap.put(FessConfig.CRAWLER_FAILURE_URL_STATUS_CODES, "404");
            defaultMap.put(FessConfig.CRAWLER_SYSTEM_MONITOR_INTERVAL, "60");
            defaultMap.put(FessConfig.CRAWLER_HOTTHREAD_ignore_idle_threads, "true");