* This class handles the initialization and validation of web and file protocols
 * used by the crawler to determine which URLs can be crawled.
 */
public class ProtocolHelper {
    private static final Logger logger = LogManager.getLogger(ProtocolHelper.class);

    /** Array of supported web protocols with colon suffix (e.g., "http:", "https:") */
    protected String[] webProtocols = StringUtil.EMPTY_STRINGS;

        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        ComponentUtil.getFessConfig();
        final ProtocolHelper protocolHelper = ComponentUtil.getProtocolHelper();

        final long startTime = systemHelper.getCurrentTimeAsLong();

        final List<String> sessionIdList = new ArrayList<>();
        crawlerList.clear();