trackFailure(e)
    }
    if (requestDone) {
      if (e != null) {
        eventListener.requestFailed(call, e)
      } else {
        eventListener.requestBodyEnd(call, bytesRead)
      }
    }
    if (responseDone) {
      if (e != null) {
        eventListener.responseFailed(call, e)
      } else {
        eventListener.responseBodyEnd(call, bytesRead)
      }
    }

import java.net.Proxy
import java.util.concurrent.TimeUnit
import okhttp3.Call
import okhttp3.Connection
import okhttp3.EventListener
import okhttp3.Handshake
import okhttp3.HttpUrl
import okhttp3.OkHttpClient
import okhttp3.Protocol
import okhttp3.Request
import okhttp3.Response

/**
 * An OkHttp EventListener, which logs call events. Can be applied as an
 * [event listener factory][OkHttpClient.eventListenerFactory].
 *

          listOf(
            ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
              .supportsTlsExtensions(false)
              .build(),
          ),
        )
        .eventListener(
          object : EventListener() {
            override fun connectionAcquired(
              call: Call,
              connection: Connection,
            ) {
              val sslSocket = connection.socket() as SSLSocket

internal class CallConnectionUser(
  private val call: RealCall,
  private val poolConnectionListener: ConnectionListener,
  private val chain: RealInterceptorChain,
) : ConnectionUser {
  private val eventListener: EventListener
    get() = call.eventListener

  override fun addPlanToCancel(connectPlan: ConnectPlan) {
    call.plansToCancel += connectPlan
  }

  override fun removePlanToCancel(connectPlan: ConnectPlan) {

      }
    val localClient = client.newBuilder().eventListener(eventListener).build()

    val call1 = localClient.newCall(Request(server.url("/")))

    call1.execute().use { response ->
      assertThat(response.body.string()).isEqualTo("Req1")
      assertThat(response.handshake).isNotNull()
      assertThat(response.protocol == Protocol.HTTP_1_1)
    }

    eventListener.closed = true

 * The performance of these calls on the underlying network. If the network’s performance isn’t sufficient, you need to either improve the network or use less of it.

### EventListener

Subclass [EventListener](https://square.github.io/okhttp/3.x/okhttp/okhttp3/EventListener.html) and override methods for the events you are interested in. In a successful HTTP call with no redirects or retries the sequence of events is described by this flow.

  @RegisterExtension
  val clientTestRule = OkHttpClientTestRule()
  private val eventListener = RecordingEventListener()
  private val listener = EventSourceRecorder()
  private var client =
    clientTestRule.newClientBuilder()
      .eventListenerFactory(clientTestRule.wrap(eventListener))
      .build()

  @BeforeEach
  fun before(server: MockWebServer) {
    this.server = server
  }

import java.io.IOException;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.util.List;
import okhttp3.Call;
import okhttp3.Connection;
import okhttp3.EventListener;
import okhttp3.Handshake;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Protocol;
import okhttp3.Request;
import okhttp3.Response;

/**

          // $0.05 worth of phone storage in 2020
          maxSize = 50L * 1024L * 1024L // 50 MiB
      ))
      .build()
```

## EventListener events 

Cache Events are exposed via the EventListener API.  Typical scenarios are below.

### Cache Hit

In the ideal scenario the cache can fulfill the request without any conditional call to the network.

import java.net.Proxy
import java.util.concurrent.TimeUnit

class ClientRuleEventListener(
  val delegate: EventListener = NONE,
  var logger: (String) -> Unit,
) : EventListener(),
  EventListener.Factory {
  private var startNs: Long? = null

  override fun create(call: Call): EventListener = this

  override fun callStart(call: Call) {
    startNs = System.nanoTime()