}

    public void test_escapeXml_allSpecialChars() {
        // Test all special characters
        String input = "Test & < > \"quote\" 'apos'";
        String expected = "Test &amp; &lt; &gt; &quot;quote&quot; &apos;apos&apos;";
        assertEquals(expected, XmlUtil.escapeXml(input));
    }

    public void test_escapeXml_noSpecialChars() {
        // Test string without special characters

     * <ul>
     *   <li>&amp; with &amp;amp;</li>
     *   <li>&lt; with &amp;lt;</li>
     *   <li>&gt; with &amp;gt;</li>
     *   <li>" with &amp;quot;</li>
     *   <li>' with &amp;apos;</li>
     * </ul>
     * Additionally, it strips invalid XML characters from the input string.
     *
     * @param value the input string to be escaped

        int pos = 0;
        int pos2 = 0;
        while (true) {
            pos = text.indexOf(fromText, pos2);
            if (pos == 0) {
                buf.append(toText);
                pos2 = fromText.length();
            } else if (pos > 0) {
                buf.append(text.substring(pos2, pos));
                buf.append(toText);
                pos2 = pos + fromText.length();
            } else {

                    final int pos = text.indexOf(term, offset);
                    if (pos > 0) {
                        final String tmp = text.substring(offset, pos);
                        readingBuf.append(transliterator.transliterate(tmp));
                        offset = pos;
                    } else if (pos == -1) {
                        continue;
                    }

     * @param regex The regular expression to match URLs.
     * @param client The CrawlerClient instance.
     * @param pos The position to add the client.
     */
    public void addClient(final String regex, final CrawlerClient client, final int pos) {
        if (StringUtil.isBlank(regex)) {
            throw new CrawlerSystemException(

     * For files larger than {@value #MAX_BUF_SIZE} bytes (10MB), an
     * {@link IORuntimeException} will be thrown to prevent OutOfMemoryError.
     * For large files, use streaming APIs instead.
     * </p>
     *
     * @param file
     *            The file. Must not be {@literal null}.
     * @return A byte array containing the contents of the file.

**Configuration**: Set `web.api.gsa=true` in `system.properties` to enable GSA compatibility features.

For most migration scenarios, we recommend using the modern JSON Search API (`/api/v1/documents`) instead.

### Admin APIs

All admin APIs require authentication (`-u admin:admin` or Bearer token).

**Base Path**: `/api/admin/`

**Available Endpoints**:
- `POST /backup/upload` - Upload backup/import files

            pos++;
            if (ch == '\\') {
                sb.append(ch);
                if (pos >= end) {
                    break; // ERROR, or let it go?
                }
                ch = s.charAt(pos);
                pos++;
            }

            sb.append(ch);
        }

        if (sb.length() > 0) {
            list.add(sb.toString());
        }

                                    <label for="pos" class="col-sm-3 text-sm-right col-form-label"><la:message
                                            key="labels.dict_kuromoji_pos"/></label>
                                    <div class="col-sm-9">
                                        <la:errors property="pos"/>
                                        <la:text styleId="pos" property="pos" styleClass="form-control"/>

            fileName = uploadedFileName;
            try {
                int pos = fileName.indexOf('/');
                if (pos >= 0) {
                    fileName = fileName.substring(pos + 1);
                }
                pos = fileName.indexOf('\\');
                if (pos >= 0) {
                    fileName = fileName.substring(pos + 1);
                }
            } catch (final Exception e) {