## Version 4.2.1

_2019-10-02_

 *  Fix: In 4.1.0 we introduced a performance regression that prevented connections from being
    pooled in certain situations. We have good test coverage for connection pooling but we missed
    this because it only occurs if you have proxy configured and you share a connection pool among
    multiple `OkHttpClient` instances.

  internal val plansToCancel = CopyOnWriteArrayList<RoutePlanner.Plan>()

  override fun timeout(): Timeout = timeout

  @SuppressWarnings("CloneDoesntCallSuperClone") // We are a final type & this saves clearing state.
  override fun clone(): Call = RealCall(client, originalRequest, forWebSocket)

  override fun request(): Request = originalRequest

  /**

 *  New: `ConnectionSpec.isCompatible(SSLSocket)`.
 *  New: `Dispatcher.getQueuedCallCount()` and
    `Dispatcher.getRunningCallCount()`. These can be useful in diagnostics.
 *  Fix: OkHttp no longer shares timeouts between pooled connections. This was
    causing some applications to crash when connections were reused.
 *  Fix: `OkApacheClient` now allows an empty `PUT` and `POST`.

    client.send(message4)
    serverListener.assertTextMessage(message4)

    // Server to client message that shares context with message1.
    val message5 = message1 + message1
    server.send(message5)
    clientListener.assertTextMessage(message5)

    // Client to server message that shares context with message2.
    val message6 = message2 + message2
    client.send(message6)

entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity. "You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License. "Source" form shall mean the preferred form for making modifications, including but not limited...

   */
  fun useHttps(sslSocketFactory: SSLSocketFactory) {
    this.sslSocketFactory = sslSocketFactory
  }

  /**
   * Configure the server to not perform SSL authentication of the client. This leaves
   * authentication to another layer such as in an HTTP cookie or header. This is the default and
   * most common configuration.
   */
  fun noClientAuth() {
    this.clientAuth = CLIENT_AUTH_NONE
  }

      /** Iterate a copy of the entries to defend against concurrent modification errors. */
      private val delegate = ArrayList(lruEntries.values).iterator()

      /** The snapshot to return from [next]. Null if we haven't computed that yet. */
      private var nextSnapshot: Snapshot? = null

      /** The snapshot to remove with [remove]. Null if removal is illegal. */
      private var removeSnapshot: Snapshot? = null

    server.enqueue(MockResponse())
    server.enqueue(MockResponse())
    val request = Request(server.url("/"))
    val response = client.newCall(request).execute()
    response.body.close()

    // This client shares a connection pool but has a different SSL socket factory.
    val handshakeCertificates2 = HandshakeCertificates.Builder().build()
    val anotherClient =
      client.newBuilder()
        .sslSocketFactory(

      "control" means (i) the power, direct or indirect, to cause the
      direction or management of such entity, whether by contract or
      otherwise, or (ii) ownership of fifty percent (50%) or more of the
      outstanding shares, or (iii) beneficial ownership of such entity.

      "You" (or "Your") shall mean an individual or Legal Entity
      exercising permissions granted by this License.

All the HTTP client configuration lives in `OkHttpClient` including proxy settings, timeouts, and caches. When you need to change the configuration of a single call, call `OkHttpClient.newBuilder()`. This returns a builder that shares the same connection pool, dispatcher, and configuration with the original client. In the example below, we make one request with a 500 ms timeout and another with a 3000 ms timeout.

=== ":material-language-kotlin: Kotlin"