level = DeprecationLevel.ERROR,
  )
  fun proxy(): Proxy? = proxy

  @JvmName("-deprecated_sslSocketFactory")
  @Deprecated(
    message = "moved to val",
    replaceWith = ReplaceWith(expression = "sslSocketFactory"),
    level = DeprecationLevel.ERROR,
  )
  fun sslSocketFactory(): SSLSocketFactory? = sslSocketFactory

  @JvmName("-deprecated_hostnameVerifier")
  @Deprecated(
    message = "moved to val",

import javax.net.ssl.SSLSocket
import javax.net.ssl.SSLSocketFactory
import javax.net.ssl.X509TrustManager
import okhttp3.Protocol

interface SocketAdapter {
  fun isSupported(): Boolean

  fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? = null

  fun matchesSocket(sslSocket: SSLSocket): Boolean

  fun matchesSocketFactory(sslSocketFactory: SSLSocketFactory): Boolean = false

  fun configureTlsExtensions(

    }
  }

  private fun enableTls() {
    client =
      client.newBuilder()
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        )
        .build()
    server.useHttps(handshakeCertificates.sslSocketFactory())
  }

      HandshakeCertificates.Builder()
        .addTrustedCertificate(rootCa.certificate)
        .build()
    val client =
      clientTestRule.newClientBuilder()
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        )
        .hostnameVerifier(RecordingHostnameVerifier())
        .certificatePinner(certificatePinner)
        .build()

returns to its clients. The returned instance can create an `SSLSocketFactory` that implements this
policy:

```java
HandshakeCertificates serverCertificates = new HandshakeCertificates.Builder()
    .heldCertificate(localhostCertificate)
    .build();
MockWebServer server = new MockWebServer();
server.useHttps(serverCertificates.sslSocketFactory(), false);
```

        val sslContext = SSLContext.getInstance("TLS")
        sslContext.init(null, arrayOf<TrustManager>(trustManager), null)
        val sslSocketFactory = sslContext.socketFactory

        client = OkHttpClient.Builder()
            .sslSocketFactory(sslSocketFactory, trustManager)
            .build()
      }

      fun run() {
        val request = Request.Builder()

    override fun verify(
      certs: Array<out X509Certificate>?,
      hostname: String?,
      session: SSLSession?,
    ): Boolean {
      return true
    }
  }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? = null

  override fun configureTlsExtensions(
    sslSocket: SSLSocket,
    hostname: String?,
    protocols: List<@JvmSuppressWildcards Protocol>,
  ) {

    val handshakeCertificates = localhost()
    server.useHttps(handshakeCertificates.sslSocketFactory())

    val dns =
      Dns {
        Dns.SYSTEM.lookup(server.hostName)
      }

    val client =
      clientTestRule.newClientBuilder()
        .sslSocketFactory(
          handshakeCertificates.sslSocketFactory(),
          handshakeCertificates.trustManager,
        )
        .dns(dns)
        .build()

    assertThat(a.sslSocketFactory).isNotNull()
    assertThat(a.x509TrustManager).isNotNull()

    // Multiple clients share the instances.
    val b = client.newBuilder().build()
    assertThat(b.dispatcher).isSameAs(a.dispatcher)
    assertThat(b.connectionPool).isSameAs(a.connectionPool)
    assertThat(b.sslSocketFactory).isSameAs(a.sslSocketFactory)

    } catch (e: UnsupportedOperationException) {
      // https://docs.oracle.com/javase/9/docs/api/javax/net/ssl/SSLSocket.html#getApplicationProtocol--
      null
    }
  }

  override fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {
    // Not supported due to access checks on JDK 9+:
    // java.lang.reflect.InaccessibleObjectException: Unable to make member of class