protected static final String START_URLS = "start_urls";

    protected static final String GOOD_URLS = "good_urls";

    protected static final String BAD_URLS = "bad_urls";

    protected String[] webProtocols = { "http:", "https:" };

    protected String[] fileProtocols = { "file:", "smb:", "smb1:", "ftp:", "storage:" };

    protected LinkedList<String> tagQueue;