*     .authenticator(okhttp3.Authenticator.Companion.JAVA_NET_AUTHENTICATOR)
 *     .build()
 * ```
 */
@Deprecated(message = "Use okhttp3.Authenticator.Companion.JAVA_NET_AUTHENTICATOR instead")
class JavaNetAuthenticator : Authenticator {
  @Throws(IOException::class)
  override fun authenticate(
    route: Route?,
    response: Response,
  ): Request? = JAVA_NET_AUTHENTICATOR.authenticate(route, response)

/**
 * Adapts [Authenticator] to [okhttp3.Authenticator]. Configure OkHttp to use [Authenticator] with
 * [okhttp3.OkHttpClient.Builder.authenticator] or [okhttp3.OkHttpClient.Builder.proxyAuthenticator].
 */
class JavaNetAuthenticator(private val defaultDns: Dns = Dns.SYSTEM) : okhttp3.Authenticator {
  @Throws(IOException::class)
  override fun authenticate(
    route: Route?,
    response: Response,
  ): Request? {

import org.junit.jupiter.api.BeforeEach
import org.junit.jupiter.api.Test

// Most tests from URLConnectionTest
class JavaNetAuthenticatorTest {
  private var authenticator = JavaNetAuthenticator()
  private val fakeDns = FakeDns()
  private val recordingAuthenticator = RecordingAuthenticator()
  private val factory =
    TestValueFactory()
      .apply {
        dns = fakeDns
      }

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

import java.io.IOException
import okhttp3.internal.authenticator.JavaNetAuthenticator

/**
 * Performs either **preemptive** authentication before connecting to a proxy server, or
 * **reactive** authentication after receiving a challenge from either an origin web server or proxy
 * server.
 *

    builder = builder.ecdsa256()
    builder = builder.rsa2048()
    val heldCertificate: HeldCertificate = builder.build()
  }

  @Test
  fun javaNetAuthenticator() {
    val authenticator = JavaNetAuthenticator()
    val response = Response.Builder().build()
    var request: Request? = authenticator.authenticate(factory.newRoute(), response)
    request = authenticator.authenticate(null, response)

        client.newBuilder()
          .proxy(server.toProxyAddress())
          .proxyAuthenticator(JavaNetAuthenticator())
          .build()
      response = getResponse(Request("http://android.com/".toHttpUrl()))
    } else {
      client =
        client.newBuilder()
          .authenticator(JavaNetAuthenticator())
          .build()
      response = getResponse(newRequest("/"))
    }

    `multipart/mixed; boundary="abc"`.

 *  New: `Authenticator.JAVA_NET_AUTHENTICATOR` forwards authentication requests to
    `java.net.Authenticator`. This obsoletes `JavaNetAuthenticator` in the `okhttp-urlconnection`
    module.

 *  New: `CertificatePinner` now offers an API for inspecting the configured pins.

 *  Upgrade: [Okio 2.6.0][okio_2_6_0].

    ```kotlin