serverSocketFactory
 * **MultipartBody.Part**: body, headers
 * **MultipartBody.**: boundary, parts, size, type
 * **OkHttpClient**: authenticator, cache, callTimeoutMillis, certificatePinner,
   connectTimeoutMillis, connectionPool, connectionSpecs, cookieJar, dispatcher, dns,
   eventListenerFactory, followRedirects, followSslRedirects, hostnameVerifier, interceptors,

import okhttp3.Request;
import okhttp3.Response;

public final class Authenticate {
  private final OkHttpClient client;

  public Authenticate() {
    client = new OkHttpClient.Builder()
        .authenticator((route, response) -> {
          if (response.request().header("Authorization") != null) {
            return null; // Give up, we've already attempted to authenticate.
          }

   * This avoids sending potentially sensitive data like HTTP cookies to the proxy unencrypted.
   *
   * In order to support preemptive authentication we pass a fake "Auth Failed" response to the
   * authenticator. This gives the authenticator the option to customize the CONNECT request. It can
   * decline to do so by returning null, in which case OkHttp will use it as-is.
   */
  @Throws(IOException::class)

 * [OkHttp AWS Signer](https://github.com/babbel/okhttp-aws-signer): AWS V4 signing algorithm for OkHttp requests
 * [okhttp-digest](https://github.com/rburgst/okhttp-digest): A digest authenticator for OkHttp.
 * [OkHttp Idling Resource](https://github.com/JakeWharton/okhttp-idling-resource): An Espresso IdlingResource for OkHttp.

  var taskRunner: TaskRunner = taskFaker.taskRunner
  var dns: Dns = Dns.SYSTEM
  var proxy: Proxy = Proxy.NO_PROXY
  var proxySelector: ProxySelector = RecordingProxySelector()
  var proxyAuthenticator: Authenticator = RecordingOkAuthenticator("password", null)
  var connectionSpecs: List<ConnectionSpec> =
    listOf(
      ConnectionSpec.MODERN_TLS,
      ConnectionSpec.COMPATIBLE_TLS,
      ConnectionSpec.CLEARTEXT,
    )

	claims.SetExpiry(UTCNow().Add(defaultJWTExpiry))
	claims.SetAccessKey(accessKey)
	token := jwtgo.NewWithClaims(jwtgo.SigningMethodHS512, claims)
	return token.SignedString([]byte(secretKey))
}

// Tests web request authenticator.
func TestWebRequestAuthenticate(t *testing.T) {
	ctx, cancel := context.WithCancel(t.Context())
	defer cancel()

	obj, fsDir, err := prepareFS(ctx)
	if err != nil {
		t.Fatal(err)
	}

package org.apache.maven.wrapper; synchronized class DefaultDownloader$1 extends java.net.Authenticator { void DefaultDownloader$1(DefaultDownloader); protected java.net.PasswordAuthenticati getPasswordAuthentic(); } org/apache/maven/wrapper/DefaultDownloader$SystemPropertiesProx.class package org.apache.maven.wrapper; synchronized class DefaultDownloader$SystemPropertiesProx extends java.net.Authenticator { private void DefaultDownloader$SystemPropertiesProx(); protected java.net.PasswordAuthenticati...

=== ":material-language-kotlin: Kotlin"
    ```kotlin
      private val client = OkHttpClient.Builder()
          .authenticator(object : Authenticator {
            @Throws(IOException::class)
            override fun authenticate(route: Route?, response: Response): Request? {
              if (response.request.header("Authorization") != null) {

      client
        .newBuilder()
        .authenticator(authenticator)
        .build()
    executeSynchronously("/")
      .assertCode(401)
    assertThat(authenticator.onlyRoute()).isNotNull()
  }

  @Test
  fun delete() {
    server.enqueue(MockResponse(body = "abc"))
    val request =
      Request
        .Builder()
        .url(server.url("/"))
        .delete()
        .build()

      ),
    )
    server.enqueue(MockResponse(body = "ABC"))
    val latch = CountDownLatch(1)
    val responses: BlockingQueue<String?> = SynchronousQueue()
    val authenticator =
      okhttp3.Authenticator { route: Route?, response: Response? ->
        responses.offer(response!!.body.string())
        try {
          latch.await()
        } catch (e: InterruptedException) {