final Map<String, List<String>> metadataMap, final int depth) {
        if (node == null || depth > maxDepth) {
            return;
        }

        if (node.isObject()) {
            extractObject((ObjectNode) node, parentKey, textBuilder, metadataMap, depth);
        } else if (node.isArray()) {
            extractArray((ArrayNode) node, parentKey, textBuilder, metadataMap, depth);
        } else {

        writeElastisearchJsonApi(zos, id, "nodes", "stats");
        writeElastisearchJsonApi(zos, id, "nodes", "_all");
        writeElastisearchJsonApi(zos, id, "nodes", "usage");
        writeElastisearchJsonApi(zos, id, "remote", "info");
        writeElastisearchJsonApi(zos, id, "tasks", "");
        writeElastisearchJsonApi(zos, id, "nodes", "hot_threads");
    }

    /**

3. **Resource Management**: `CurlResponse` implements `Closeable` for try-with-resources
4. **Async Support**: Both synchronous (`executeSync()`) and asynchronous (`execute()`) execution modes

## Technical Details

- **Java Version**: 17+
- **Dependencies**:
  - Apache Commons IO 2.19.0 (runtime)
  - JUnit 4.13.2 (test)
- **Module Name**: `org.codelibs.curl4j`

        return fessConfig.isCrawlerDocumentDuplicateTermRemoved();
    }

    /**
     * Gets the array of space character codes from configuration.
     *
     * @return array of character codes to be treated as spaces
     */
    protected int[] getSpaceChars() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();

        // create runner instance
        runner = new OpenSearchRunner();
        // create ES nodes
        final String clusterName = UUID.randomUUID().toString();
        runner.onBuild((number, settingsBuilder) -> {
            settingsBuilder.put("http.cors.enabled", true);
            settingsBuilder.put("discovery.type", "single-node");
        }).build(newConfigs().clusterName(clusterName).numOfNode(1));

        try {
            final XPathNodes list = getXPathAPI().selectNodeList(document, "//BASE");
            if (list.size() > 0) {
                final Node node = list.get(0);
                final Node attrNode = node.getAttributes().getNamedItem("href");
                if (attrNode != null) {
                    String attrValue = attrNode.getNodeValue();

 * </p>
 *
 * @author higa
 */
public abstract class Base64Util {

    /**
     * Do not instantiate.
     */
    protected Base64Util() {
    }

    /**
     * Encodes data in Base64.
     * <p>
     * This method uses {@link java.util.Base64.Encoder} for encoding.
     * </p>
     *
     * @param inData
     *            The data to encode

     * The matching is based on tag name, and optionally ID, CSS class, or custom attributes.
     *
     * @param node the DOM node to check against this pruned tag configuration
     * @return true if the node matches this pruned tag configuration, false otherwise
     */
    public boolean matches(final Node node) {
        if (tag.equalsIgnoreCase(node.getNodeName())) {

    }

    /**
     * Stores current search parameters in a browser cookie for later retrieval.
     *
     * This method serializes the current request parameters, compresses them using GZIP,
     * encodes them with Base64, and stores them in a secure HTTP cookie.
     */
    public void storeSearchParameters() {
        LaRequestUtil.getOptionalRequest().ifPresent(req -> {

     * Processes Google on/off comment directives in the node.
     *
     * @param node the node to process
     * @param flag the flag indicating whether content should be included
     * @return the processed node
     */
    protected Node processGoogleOffOn(final Node node, final ValueHolder<Boolean> flag) {
        final NodeList nodeList = node.getChildNodes();
        List<Node> removedNodeList = null;