ResponseData responseData = new ResponseData();
        Map<String, Object> dataMap = new HashMap<>();
        assertEquals("", documentHelper.getContent(null, responseData, null, dataMap));
        assertEquals("", documentHelper.getContent(null, responseData, "", dataMap));
        assertEquals("", documentHelper.getContent(null, responseData, " ", dataMap));

            }
            ResponseData responseData = new ResponseData();
            responseData.setCharSet("UTF-8");
            responseData.setContentLength(data.length());
            responseData.setExecutionTime(1000L);
            responseData.setHttpStatusCode(200);
            responseData.setLastModified(new Date());
            responseData.setMethod("GET");

        responseData.setExecutionTime(500L);
        assertEquals(500L, responseData.getExecutionTime());
    }

    @Test
    public void test_responseData_parentUrl() {
        final ResponseData responseData = new ResponseData();

        assertNull(responseData.getParentUrl());
        responseData.setParentUrl("http://example.com/parent");

     *
     * @param responseData the response data from crawling
     * @param resultData the result data to store processed information
     */
    @Override
    protected void storeData(final ResponseData responseData, final ResultData resultData) {
        final DOMParser parser = getDomParser();
        try (final BufferedInputStream bis = new BufferedInputStream(responseData.getResponseBody())) {

        try (final ResponseData responseData = client.execute(RequestDataBuilder.newRequestData().get().url(url).build())) {
            if (responseData.getRedirectLocation() != null) {
                final Set<RequestData> childUrlList = new HashSet<>();
                childUrlList.add(RequestDataBuilder.newRequestData().get().url(responseData.getRedirectLocation()).build());

     * for thumbnail generation.
     *
     * @param responseData the response data containing MIME type information
     * @return true if the MIME type represents a supported image format, false otherwise
     */
    protected boolean isImageMimeType(final ResponseData responseData) {
        final String mimeType = responseData.getMimeType();
        if (mimeType == null) {
            return true;
        }

            final org.codelibs.fess.crawler.entity.ResultData resultData = new org.codelibs.fess.crawler.entity.ResultData();
            Map<String, Object> dataMap = new HashMap<>();
            if (responseData != null) {
                dataMap.put("url", responseData.getUrl());
            }

        }

        return process(thumbnailId, responseData -> {
            final String mimeType = responseData.getMimeType();
            final String extension = getExtensionFromMimeType(mimeType);
            final File tempFile = ComponentUtil.getSystemHelper().createTempFile("thumbnail_", extension);
            try {
                CopyUtil.copy(responseData.getResponseBody(), tempFile);