public final fun certificatePinner ()Lokhttp3/CertificatePinner;
	public final fun connectTimeoutMillis ()I
	public final fun connectionPool ()Lokhttp3/ConnectionPool;
	public final fun connectionSpecs ()Ljava/util/List;
	public final fun cookieJar ()Lokhttp3/CookieJar;
	public final fun dispatcher ()Lokhttp3/Dispatcher;
	public final fun dns ()Lokhttp3/Dns;

   * [Call.request] is a redirect to a different host.
   *
   * If the [Call] is able to reuse an existing pooled connection, this method will not be invoked.
   * See [ConnectionPool].
   */
  open fun dnsStart(
    call: Call,
    domainName: String,
  ) {
  }

  /**
   * Invoked immediately after a DNS lookup.
   *
   * This method is invoked after [dnsStart].

 *
 * Typically instances of this class are created, connected and exercised automatically by the HTTP
 * client. Applications may use this class to monitor HTTP connections as members of a
 * [connection pool][ConnectionPool].
 *
 * Do not confuse this class with the misnamed `HttpURLConnection`, which isn't so much a connection
 * as a single request/response exchange.
 *
 * ## Modern TLS
 *

	public final fun certificatePinner ()Lokhttp3/CertificatePinner;
	public final fun connectTimeoutMillis ()I
	public final fun connectionPool ()Lokhttp3/ConnectionPool;
	public final fun connectionSpecs ()Ljava/util/List;
	public final fun cookieJar ()Lokhttp3/CookieJar;
	public final fun dispatcher ()Lokhttp3/Dispatcher;
	public final fun dns ()Lokhttp3/Dns;

TCP socket connection. Sharing a connection has substantial performance benefits: lower latency, higher throughput (due to [TCP slow start](https://www.igvita.com/2011/10/20/faster-web-vs-tcp-slow-start/)) and conserved battery. OkHttp uses a [ConnectionPool](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-connection-pool/) that automatically reuses HTTP/1.x connections and multiplexes HTTP/2 connections.

In OkHttp some fields of the address come from the URL (scheme, hostname, port)...

   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,

    client =
      OkHttpClient
        .Builder()
        .connectionPool(client.connectionPool)
        .proxy(server.proxyAddress)
        .build()
    executeSynchronously("/a").assertBody("abc")
    client =
      OkHttpClient
        .Builder()
        .connectionPool(client.connectionPool)
        .proxy(server.proxyAddress)
        .build()

    val hostnameVerifier = RecordingHostnameVerifier()
    val cookieJar: CookieJar = JavaNetCookieJar(CookieManager())
    val connectionPool = ConnectionPool()
    client =
      OkHttpClient
        .Builder()
        .cache(cache)
        .connectionPool(connectionPool)
        .cookieJar(cookieJar)
        .sslSocketFactory(clientSocketFactory, handshakeCertificates.trustManager)

        writer.windowUpdate(0, (windowSize - DEFAULT_INITIAL_WINDOW_SIZE).toLong())
      }
    }
    // Thread doesn't use client Dispatcher, since it is scoped potentially across clients via
    // ConnectionPool.
    taskRunner.newQueue().execute(name = connectionName, block = readerRunnable)
  }

  /** Merges [settings] into this peer's settings and sends them to the remote peer. */
  @Throws(IOException::class)

    assert200Http2Response(execute(url), server.hostName)
    val sanUrl = url.newBuilder().host("san.com").build()
    assert200Http2Response(execute(sanUrl), "san.com")
    assertThat(client.connectionPool.connectionCount()).isEqualTo(1)
  }

  /**
   * Test connecting to an alternative host then common name, although only subject alternative
   * names are used if present no special consideration of common name.