ResponseData responseData1 = new ResponseData();
        responseData1.setUrl("https://example.com/page1");

        ResponseData responseData2 = new ResponseData();
        responseData2.setUrl("https://example.com/page2");

        ResponseData responseData3 = new ResponseData();
        responseData3.setUrl("https://example.com/page3");

        // Execute multiple times - should not throw any exception

        SitemapUrl sitemap1 = new SitemapUrl();
        sitemap1.setLoc("https://example.com/page1");

        SitemapUrl sitemap2 = new SitemapUrl();
        sitemap2.setLoc("https://example.com/page2");

        SitemapUrl sitemap3 = new SitemapUrl();
        sitemap3.setLoc("https://example.com/page3");

        SitemapSet sitemapSet = new SitemapSet();
        sitemapSet.addSitemap(sitemap1);

     */
    public static final String PATH_SEPARATOR = System.getProperty("path.separator");

    /**
     * <code>os.name</code> system property. Example: <code>Mac OS X</code>
     */
    public static final String OS_NAME = System.getProperty("os.name");

    /**
     * <code>java.io.tmpdir</code> system property. Example: /tmp
     */

        RequestData data1 = RequestDataBuilder.newRequestData().get().url("https://example.com/get").weight(1.0f).build();

        assertEquals(Method.GET, data1.getMethod());
        assertEquals("https://example.com/get", data1.getUrl());

        RequestData data2 = RequestDataBuilder.newRequestData().post().url("https://example.com/post").weight(2.0f).build();

        assertEquals(Method.POST, data2.getMethod());

        assertNotNull(Curl.get("https://secure.example.com/path?param=value"));
        assertNotNull(Curl.post("http://api.example.com/v1/resource"));
        assertNotNull(Curl.put("ftp://files.example.com/upload"));
        assertNotNull(Curl.delete("http://localhost:8080/delete"));
        assertNotNull(Curl.head("https://cdn.example.com/assets/file.js"));
        assertNotNull(Curl.options("http://cors.example.com/api"));

        method.invoke(crawlerThread, "http://example.com/child", "http://example.com/", 1.0f, 2);

        verify(urlQueueService, times(1)).offerAll(anyString(), any());
    }

    /**
     * Test storeChildUrl with depth exceeding maxDepth.
     */
    public void test_storeChildUrl_exceedsMaxDepth() throws Exception {
        when(urlFilter.match("http://example.com/child")).thenReturn(true);

        Long id = 999L;
        String sessionId = "crawl-session-123";
        String method = "POST";
        String url = "https://api.example.com/endpoint";
        String metaData = "{\"priority\":\"high\"}";
        String encoding = "UTF-8";
        String parentUrl = "https://api.example.com";
        Integer depth = 3;
        Long lastModified = System.currentTimeMillis() - 10000;

                + "mailto:test@example.com\n" + "https://www.example.com/page4.html";
        final InputStream in = new ByteArrayInputStream(text.getBytes());
        final SitemapSet sitemapSet = sitemapsHelper.parse(in);
        final Sitemap[] sitemaps = sitemapSet.getSitemaps();

        // Should parse only valid http/https URLs

        urlList.add("https://example.com/admin/.*");
        urlList.add("https://example.com/private/.*");
        urlList.add("https://example.com/secret/.*");

        // Execute
        service.addExcludeUrlFilter(sessionId, urlList);

        // Verify
        verify(dataHelper).addExcludeUrlPattern(sessionId, "https://example.com/admin/.*");

        Proxy proxy = Proxy.NO_PROXY;

        CurlRequest result = request.proxy(proxy);

        assertSame(request, result); // Fluent API
        assertSame(proxy, request.proxy());
    }

    @Test
    public void testEncodingMethod() {
        CurlRequest request = new CurlRequest(Method.GET, "https://example.com");
        String encoding = "ISO-8859-1";