instance="prototype">
		<property name="connectionTimeout">15000</property>
		<property name="soTimeout">30000</property>
	</component>

	<!-- HC4 (Alternative - for backward compatibility) -->
	<component name="internalHc4HttpClient" class="org.codelibs.fess.crawler.client.http.Hc4HttpClient"
		instance="prototype">
		<property name="connectionTimeout">15000</property>
		<property name="soTimeout">30000</property>

        failureUrlPager.id = "testId";
        failureUrlPager.url = "http://test.example.com";
        failureUrlPager.threadName = "crawler-1";
        failureUrlPager.errorCount = "5";
        failureUrlPager.errorName = "ConnectionTimeout";
        failureUrlPager.setAllRecordCount(100);
        failureUrlPager.setAllPageCount(10);
        failureUrlPager.setExistPrePage(true);
        failureUrlPager.setExistNextPage(true);

 *
 * @author shinsuke
 */
public abstract class HcHttpClient extends AbstractCrawlerClient {

    /** Property name for connection timeout setting */
    public static final String CONNECTION_TIMEOUT_PROPERTY = "connectionTimeout";

    /** Property name for socket timeout setting */
    public static final String SO_TIMEOUT_PROPERTY = "soTimeout";

    /** Property name for proxy host setting */

HcHttpClient (abstract base class)
    ├── Hc4HttpClient
    └── Hc5HttpClient
```

Switch via system property: `-Dfess.crawler.http.client=hc4` or `hc5` (default)

**Key Properties**: `connectionTimeout`, `soTimeout`, `proxyHost`, `proxyPort`, `userAgent`, `robotsTxtEnabled`, `ignoreSslCertificate`, `maxTotalConnection`, `defaultMaxConnectionPerRoute`

### CrawlerClientFactory