<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>
	</component>
	<component name="httpClient"

 * @param source the source used to read bytes from the socket.
 */
internal fun Socket.isHealthy(source: BufferedSource): Boolean =
  try {
    val readTimeout = soTimeout
    try {
      soTimeout = 1
      !source.exhausted()
    } finally {
      soTimeout = readTimeout
    }
  } catch (_: SocketTimeoutException) {
    true // Read timed out; socket is good.
  } catch (_: IOException) {

    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 */
    public static final String PROXY_HOST_PROPERTY = "proxyHost";

    /** Property name for proxy port setting */

    }

    /**
     * Sets the socket timeout in milliseconds.
     *
     * @param soTimeout The socket timeout
     */
    public void setSoTimeout(final Integer soTimeout) {
        this.soTimeout = soTimeout;
    }

    /**
     * Sets the cookie specification to use.
     *
     * @param cookieSpec The cookie specification
     */

    }

    /**
     * Sets the socket timeout in milliseconds.
     *
     * @param soTimeout The socket timeout
     */
    public void setSoTimeout(final Integer soTimeout) {
        this.soTimeout = soTimeout;
    }

    /**
     * Sets the cookie specification to use.
     *
     * @param cookieSpec The cookie specification
     */

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

Pattern-based client selection (from `crawler/client.xml`):

    this.rawSocket = rawSocket

    // Handle the race where cancel() precedes connectSocket(). We don't want to miss a cancel.
    if (canceled) {
      throw IOException("canceled")
    }

    rawSocket.soTimeout = socketReadTimeoutMillis
    try {
      Platform.get().connectSocket(rawSocket, route.socketAddress, socketConnectTimeoutMillis)
    } catch (e: ConnectException) {

-XX:MaxGCPauseMillis=60000\n\
-XX:G1NewSizePercent=5\n\
-XX:G1MaxNewSizePercent=5\n\
-Djcifs.smb.client.responseTimeout=30000\n\
-Djcifs.smb.client.soTimeout=35000\n\
-Djcifs.smb.client.connTimeout=60000\n\
-Djcifs.smb.client.sessionTimeout=60000\n\
-Djcifs.smb1.smb.client.connTimeout=60000\n\
-Djcifs.smb1.smb.client.soTimeout=35000\n\
-Djcifs.smb1.smb.client.responseTimeout=30000\n\
-Dio.netty.noUnsafe=true\n\
-Dio.netty.noKeySetOptimization=true\n\

     * -XX:G1MaxNewSizePercent=5<br>
     * -Djcifs.smb.client.responseTimeout=30000<br>
     * -Djcifs.smb.client.soTimeout=35000<br>
     * -Djcifs.smb.client.connTimeout=60000<br>
     * -Djcifs.smb.client.sessionTimeout=60000<br>
     * -Djcifs.smb1.smb.client.connTimeout=60000<br>
     * -Djcifs.smb1.smb.client.soTimeout=35000<br>
     * -Djcifs.smb1.smb.client.responseTimeout=30000<br>
     * -Dio.netty.noUnsafe=true<br>