}
        try (final ResponseData responseData = storageClient.doHead("storage://fess/dir1/")) {
            assertNull(responseData);
        }
        try (final ResponseData responseData = storageClient.doHead("storage://fess/dir1/dir2/")) {
            assertNull(responseData);
        }
        try (final ResponseData responseData = storageClient.doHead("storage://fess/dir3/")) {
            assertNull(responseData);
        }

        this.charset = charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

            params.put(FtpClient.FTP_AUTHENTICATIONS_PROPERTY, new FtpAuthentication[] { auth });
            ftpClient.setInitParameterMap(params);
            final ResponseData responseData = ftpClient.doHead("ftp://localhost:" + FTP_PORT + "/text1.txt");
            assertNotNull(responseData.getLastModified());
            assertTrue(responseData.getLastModified().getTime() < new Date().getTime());

            return responseData;
        }

        /*
         * (non-Javadoc)
         *
         * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
         */
        public ResponseData doHead(final String url) {
            final long now = SystemUtil.currentTimeMillis();
            if (now - previousTime < interval) {
                throw new IllegalStateException();

        return charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        return charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        return processRequest(uri, true);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.client.CrawlerClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        this.charset = charset;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.robot.client.S2RobotClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        try {
            final ResponseData responseData = processRequest(url, false);
            responseData.setMethod(Constants.HEAD_METHOD);

        }
        return doHttpMethod(url, httpGet);
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.http.HttpClient#doHead(java.lang.String)
     */
    @Override
    public ResponseData doHead(final String url) {
        HttpUriRequest httpHead;
        try {
            httpHead = new HttpHead(url);
        } catch (final IllegalArgumentException e) {

				currentPartBytes := v - partOffset
				currentPartDareBytes := v - partDarePkgOffset
				if currentPartBytes < toRead {
					toRead -= currentPartBytes
					l += getEncSize(currentPartDareBytes)
				} else {
					// current part has the last
					// byte required
					lbPartOffset := partOffset + toRead - 1

					// round up the lbPartOffset
					// to the end of the
					// corresponding DARE package