final String proxyHost = fessConfig.getHttpProxyHost();
        final String proxyPort = fessConfig.getHttpProxyPort();
        if (StringUtil.isNotBlank(proxyHost) && StringUtil.isNotBlank(proxyPort)) {
            paramMap.put(Param.Client.PROXY_HOST, proxyHost);
            paramMap.put(Param.Client.PROXY_PORT, proxyPort);
            final String proxyUsername = fessConfig.getHttpProxyUsername();

        if (StringUtil.isNotBlank(appType)) {
            return appType;
        }
        return StringUtil.EMPTY;
    }

    public static OptionalEntity<String> getOverrideConfPath() {
        if (FESS_APP_DOCKER.equalsIgnoreCase(getAppType())) {
            final String confPath = System.getenv(FESS_OVERRIDE_CONF_PATH);
            if (StringUtil.isNotBlank(confPath)) {

                stream(crawlingConfig.getVirtualHosts()).get(stream -> stream.filter(StringUtil::isNotBlank).collect(Collectors.toList())));
        // id
        putResultDataBody(dataMap, fessConfig.getIndexFieldId(), crawlingInfoHelper.generateId(dataMap));
        // parentId
        String parentUrl = responseData.getParentUrl();
        if (StringUtil.isNotBlank(parentUrl)) {
            parentUrl = pathMappingHelper.replaceUrl(sessionId, parentUrl);

            return true;
        }
        return false;
    }

    public void addChildUrlRule(final String tagName, final String attrName) {
        if (StringUtil.isNotBlank(tagName) && StringUtil.isNotBlank(attrName)) {
            childUrlRuleMap.put(tagName, attrName);
        }
    }

    protected XPathAPI getXPathAPI() {
        XPathAPI cachedXPathAPI = xpathAPI.get();

            }
        }
        if (!targetList.isEmpty()) {
            insertAll(targetList.stream()
                    .filter(urlQueue -> StringUtil.isNotBlank(urlQueue.getSessionId()) && StringUtil.isNotBlank(urlQueue.getUrl()))
                    .collect(Collectors.toList()), OpType.CREATE, true);
            if (logger.isDebugEnabled()) {

                        buildNumber = node.getTextContent();
                    }
                }
            }
        }
        if (StringUtil.isNotBlank(timestamp) && StringUtil.isNotBlank(buildNumber)) {
            return timestamp + "-" + buildNumber;
        }
        return null;
    }

    protected String getRepositoryContent(final String url) {

    public FesenClient() {
        address = System.getProperty(HTTP_ADDRESS, "localhost:9200").trim();
        final String targets = System.getProperty(TARGET_INDICES);
        if (StringUtil.isNotBlank(targets)) {
            targetIndices = Arrays.stream(targets.split(",")).map(String::trim).toArray(n -> new String[n]);
        }
    }

    public void setAddress(final String address) {

            final Integer size, final SortBuilder<?>... sortBuilders) {
        return getList(clazz, builder -> {
            if (StringUtil.isNotBlank(sessionId)) {
                if (queryBuilder instanceof BoolQueryBuilder) {
                    ((BoolQueryBuilder) queryBuilder).filter(QueryBuilders.termQuery(SESSION_ID, sessionId));
                } else {