/** Default character encoding to use when none is specified. */
    protected String defaultEncoding;

    /** Number of bytes to read from input stream to determine character set encoding.
     * If you want to follow a html spec, use 512. */
    protected int preloadSizeForCharset = 2048;

    /**
     * Pattern for invalid URLs.
     */
    protected Pattern invalidUrlPattern = Pattern.compile("^\\s*javascript:|" //