* SwitchableHttpClient is a switchable HTTP client that can use either Apache HttpComponents 4.x or 5.x.
 * The client implementation is selected based on the system property {@code fess.crawler.http.client}.
 *
 * <p>Supported values:</p>
 * <ul>
 *   <li>{@code hc4} - Use Apache HttpComponents 4.x ({@link Hc4HttpClient})</li>
 *   <li>{@code hc5} or not set - Use Apache HttpComponents 5.x ({@link Hc5HttpClient}) - default</li>
 * </ul>
 *

### HTTP Client Architecture

```
SwitchableHttpClient (extends FaultTolerantClient)
    ├── Hc5HttpClient (default) - Apache HttpComponents 5.x
    └── Hc4HttpClient (fallback) - Apache HttpComponents 4.x

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

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

 */

package okhttp3.internal.http

// HTTP Status Codes not offered by HttpUrlConnection.
//
// https://datatracker.ietf.org/doc/html/rfc7231#page-47
//
// From https://github.com/apache/httpcomponents-core/blob/master/httpcore5/src/main/java/org/apache/hc/core5/http/HttpStatus.java

/** `100 Continue` (HTTP/1.1 - RFC 7231)  */
const val HTTP_CONTINUE = 100

/** `101 Switching Protocols` (HTTP/1.1 - RFC 9110)  */

 */
package org.codelibs.fess.crawler.client.http;

import org.codelibs.fess.crawler.client.AbstractCrawlerClient;

/**
 * HcHttpClient is the abstract base class for HTTP client implementations
 * using Apache HttpComponents. This class provides common constants and
 * configurations shared between HC4 and HC5 implementations.
 *
 * <p>Key properties and configurations:</p>
 * <ul>

import org.apache.hc.core5.http.io.entity.EntityUtils
import org.junit.jupiter.api.AfterEach
import org.junit.jupiter.api.Test

/**
 * Apache HttpClient 5.x.
 *
 * https://hc.apache.org/httpcomponents-client-5.0.x/index.html
 *
 * Baseline test if we ned to validate OkHttp behaviour against other popular clients.
 */
class ApacheHttpClientTest {
  private val httpClient = HttpClients.createDefault()

import org.junit.After
import org.junit.Assert.assertEquals
import org.junit.Ignore
import org.junit.Test
import org.junit.runner.RunWith

/**
 * Apache HttpClient 5.x.
 *
 * https://hc.apache.org/httpcomponents-client-5.0.x/index.html
 */
@Ignore("Failing with Netty errors")
@RunWith(AndroidJUnit4::class)
class ApacheHttpClientTest {
  private var httpClient = HttpClients.createDefault()

  @After fun tearDown() {

import org.apache.logging.log4j.Logger;
import org.codelibs.core.timer.TimeoutTarget;

/**
 * Hc4ConnectionMonitorTarget is responsible for monitoring and managing HTTP client connections
 * for Apache HttpComponents 4.x. It implements the TimeoutTarget interface to handle connection
 * expiration events.
 *
 * <p>This class uses an instance of HttpClientConnectionManager to manage the connections.

import org.apache.hc.core5.http.ProtocolVersion
import org.junit.Assert
import org.junit.Ignore
import org.junit.Test

/**
 * Simplified from
 * https://hc.apache.org/httpcomponents-client-5.0.x/httpclient5/examples/AsyncClientTlsAlpn.java
 *
 * Mainly intended to verify behaviour of popular clients across Android versions, similar
 * to observing Firefox or Chrome browser behaviour.
 */

import org.apache.logging.log4j.Logger;
import org.codelibs.core.timer.TimeoutTarget;

/**
 * Hc5ConnectionMonitorTarget is responsible for monitoring and managing HTTP client connections
 * for Apache HttpComponents 5.x. It implements the TimeoutTarget interface to handle connection
 * expiration events.
 *
 * <p>This class uses an instance of HttpClientConnectionManager to manage the connections.

package org.codelibs.fess.crawler.client.http;

import org.apache.http.auth.AuthScheme;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.Credentials;

/**
 * Authentication class for Apache HttpComponents 4.x (HC4).
 * This class provides methods to handle authentication details such as
 * authentication scope, credentials, and authentication scheme.
 *
 * <p>