init();
        }

        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        final List<LabelTypeItem> labelList;
        if (StringUtil.isBlank(virtualHostKey)) {
            labelList =
                    labelTypeItemList.stream().filter(item -> matchLocale(requestLocale, item.getLocale())).collect(Collectors.toList());
        } else {

                if (resultsPerPage instanceof Integer) {
                    form.num = (Integer) resultsPerPage;
                }
            }
        }

        if (StringUtil.isBlank(form.q) && form.fields.isEmpty() && !form.hasConditionQuery()) {
            // redirect to index page
            form.q = null;
            return redirectToRoot();
        }

        try {

                writeHeaders(response);
                final String responseContentType = curlResponse.getHeaderValue("Content-Type");
                if (StringUtil.isBlank(responseContentType)) {
                    response.setHeader("Content-Type", "application/json");
                } else {
                    response.setHeader("Content-Type", responseContentType);
                }

        if (config == null) {
            return OptionalThing.empty();
        }
        final String pipeline = config.getConfigParameterMap(ConfigName.CONFIG).get(Config.PIPELINE);
        if (StringUtil.isBlank(pipeline)) {
            return OptionalThing.empty();
        }
        return OptionalThing.of(pipeline);
    }

    public void refresh() {
        crawlingConfigCache.invalidateAll();
    }

        if (StringUtil.isNotBlank(fessConfig.getIndexDictionaryPrefix())) {
            String dictionaryPath = System.getProperty("fess.dictionary.path", StringUtil.EMPTY);
            if (StringUtil.isBlank(dictionaryPath)) {
                System.setProperty("fess.dictionary.path", fessConfig.getIndexDictionaryPrefix() + "/");
            } else {
                if (!dictionaryPath.endsWith("/")) {

        }
        return client;
    }

    protected List<Pair<String, Pattern>> getClientRuleList(final String value) {
        if (StringUtil.isBlank(value)) {
            return Collections.emptyList();
        }
        return split(value, ",").get(stream -> stream.map(String::trim)//
                .map(s -> clientRuleCache.computeIfAbsent(s, t -> {

        // TODO use cache
    }

    @Override
    public boolean visited(final OpenSearchUrlQueue urlQueue) {
        final String url = urlQueue.getUrl();
        if (StringUtil.isBlank(url)) {
            if (logger.isDebugEnabled()) {
                logger.debug("URL is a blank: {}", url);
            }
            return false;
        }

        }
    }

    protected List<String> getDefaultGroupList() {
        final String value = ComponentUtil.getFessConfig().getSystemProperty("aad.default.groups");
        if (StringUtil.isBlank(value)) {
            return Collections.emptyList();
        }
        return split(value, ",").get(stream -> stream.filter(StringUtil::isNotBlank).map(String::trim).collect(Collectors.toList()));
    }

            }, this::asListHtml);
        }
    }

    protected void verifyPassword(final CreateForm form, final VaErrorHook validationErrorLambda) {
        if (form.crudMode == CrudMode.CREATE && StringUtil.isBlank(form.password)) {
            resetPassword(form);
            throwValidationError(messages -> {
                messages.addErrorsBlankPassword("password");
            }, validationErrorLambda);
        }

            return name.substring(pos + 1);
        }
        return name;
    }

    private void executeCommand(final File inputFile, final File outputFile) {

        if (StringUtil.isBlank(command)) {
            throw new CrawlerSystemException("command is empty.");
        }

        final Map<String, String> params = new HashMap<>();
        params.put("$INPUT_FILE", inputFile.getAbsolutePath());