```

### CrawlerThread (`CrawlerThread.java`)

Worker thread for crawling.

**Flow**: Poll URL → Validate → Get client → Delay → Check last-modified → Execute → Process → Extract children → Queue children → Delay

### CrawlerClientFactory

Pattern-based client selection using `LinkedHashMap<Pattern, CrawlerClient>`.

**Standard Patterns**:
```java
"^https?://.*"     → httpClient

import org.jspecify.annotations.Nullable;

/**
 * Tests for {@link Quantiles}.
 *
 * @author Pete Gillin
 */
@NullUnmarked
public class QuantilesTest extends TestCase {

  /*
   * Since Quantiles provides a fluent-style API, each test covers a chain of methods resulting in
   * the computation of one or more quantiles (or in an error) rather than individual methods. The
   * tests are divided into three sections:

import org.jspecify.annotations.Nullable;

/**
 * Tests for {@link Quantiles}.
 *
 * @author Pete Gillin
 */
@NullUnmarked
public class QuantilesTest extends TestCase {

  /*
   * Since Quantiles provides a fluent-style API, each test covers a chain of methods resulting in
   * the computation of one or more quantiles (or in an error) rather than individual methods. The
   * tests are divided into three sections:

		<property name="charset">"UTF-8"</property>
	</component>

	<component name="s3Client"
		class="org.codelibs.fess.crawler.client.s3.S3Client" instance="prototype">
		<property name="charset">"UTF-8"</property>
	</component>

	<component name="gcsClient"
		class="org.codelibs.fess.crawler.client.gcs.GcsClient" instance="prototype">
		<property name="charset">"UTF-8"</property>
	</component>

### Client Binaries

filename | sha512 hash
-------- | -----------
[kubernetes-client-darwin-amd64.tar.gz](https://dl.k8s.io/v1.32.11/kubernetes-client-darwin-amd64.tar.gz) | 30988c325e6a50d282b24c9580fa41002bfcc96760633c1640ee1c5ab22c55bf74e3f5f31ce188a8cdeaa0a1748a652de6358c16c41dcbb45168f7657f211fa8

### Client Binaries

filename | sha512 hash
-------- | -----------
[kubernetes-client-darwin-amd64.tar.gz](https://dl.k8s.io/v1.35.0/kubernetes-client-darwin-amd64.tar.gz) | `e7d510566442afd96dd3759764b573719469bb0ef00086d536bd7af0b8af29ddf150e6ece5ae95856daaaf7f2454f45755ac300648c692508e445aca7a8bd0de`

     *
     * @return the thread pool
     */
    @Override
    public ThreadPool threadPool() {
        return client.threadPool();
    }

    /**
     * Gets the admin client for cluster and index administration.
     *
     * @return the admin client
     */
    @Override
    public AdminClient admin() {
        return client.admin();
    }

    /**

    /**
     * Retrieves the appropriate crawler client for the given URL based on configured rules.
     * This method uses client rules to determine which specific client implementation
     * should be used for crawling the URL, falling back to the default client if no
     * specific rule matches.
     *
     * @param url the URL to get a client for
     * @return the crawler client instance to use for the URL
     */
    @Override

            }
        };
        client.setAccessTimeout(1);
        try {
            client.doGet("gcs://test/file.txt");
            fail();
        } catch (CrawlingAccessException e) {
            assertTrue(e.getCause() instanceof InterruptedException);
        }
    }

    public void test_doHead_accessTimeoutTarget() {
        GcsClient client = new GcsClient() {
            @Override

            }
        };
        client.setAccessTimeout(1);
        try {
            client.doGet("s3://test/file.txt");
            fail();
        } catch (CrawlingAccessException e) {
            assertTrue(e.getCause() instanceof InterruptedException);
        }
    }

    public void test_doHead_accessTimeoutTarget() {
        S3Client client = new S3Client() {
            @Override