response only if the response code is HTTP/1.1 304 Not Modified.
 
 - CallStart
 - **CacheConditionalHit**
 - ConnectionAcquired
 - ... Standard Events...
 - ResponseBodyEnd _(0 bytes)_
 - **CacheHit**
 - ConnectionReleased
 - CallEnd
 
## Cache directory

The cache directory must be exclusively owned by a single instance.

Deleting the cache when it is no longer needed can be done.  However this may delete the purpose of the cache

import okhttp3.CallEvent.CallEnd
import okhttp3.CallEvent.CallStart
import okhttp3.CallEvent.ConnectEnd
import okhttp3.CallEvent.ConnectStart
import okhttp3.CallEvent.ConnectionAcquired
import okhttp3.CallEvent.ConnectionReleased
import okhttp3.CallEvent.DnsEnd
import okhttp3.CallEvent.DnsStart
import okhttp3.CallEvent.FollowUpDecision
import okhttp3.CallEvent.ProxySelectEnd
import okhttp3.CallEvent.ProxySelectStart

  ) : ConnectionEvent()

  data class ConnectionAcquired(
    override val timestampNs: Long,
    override val connection: Connection,
    val call: Call,
  ) : ConnectionEvent()

  data class ConnectionReleased(
    override val timestampNs: Long,
    override val connection: Connection,
    val call: Call,
  ) : ConnectionEvent() {
    override fun closes(event: ConnectionEvent): Boolean =

import okhttp3.CallEvent.CallEnd
import okhttp3.CallEvent.CallStart
import okhttp3.CallEvent.ConnectEnd
import okhttp3.CallEvent.ConnectStart
import okhttp3.CallEvent.ConnectionAcquired
import okhttp3.CallEvent.ConnectionReleased
import okhttp3.CallEvent.DnsEnd
import okhttp3.CallEvent.DnsStart
import okhttp3.CallEvent.FollowUpDecision
import okhttp3.CallEvent.ProxySelectEnd
import okhttp3.CallEvent.ProxySelectStart

      check(toClose == null)
      return ReusePlan(candidate)
    }

    // The call's connection was released.
    toClose?.closeQuietly()
    call.eventListener.connectionReleased(call, candidate)
    candidate.connectionListener.connectionReleased(candidate, call)
    if (toClose != null) {
      candidate.connectionListener.connectionClosed(candidate)
    } else if (noNewExchangesEvent) {

	public fun connectStart (Lokhttp3/Call;Ljava/net/InetSocketAddress;Ljava/net/Proxy;)V
	public fun connectionAcquired (Lokhttp3/Call;Lokhttp3/Connection;)V
	public fun connectionReleased (Lokhttp3/Call;Lokhttp3/Connection;)V
	public fun dispatcherQueueEnd (Lokhttp3/Call;Lokhttp3/Dispatcher;)V
	public fun dispatcherQueueStart (Lokhttp3/Call;Lokhttp3/Dispatcher;)V

  }

  data class ConnectionAcquired(
    override val timestampNs: Long,
    override val call: Call,
    val connection: Connection,
  ) : CallEvent()

  data class ConnectionReleased(
    override val timestampNs: Long,
    override val call: Call,
    val connection: Connection,
  ) : CallEvent() {

    // CallStart, ProxySelectStart, ProxySelectEnd, DnsStart, DnsEnd, ConnectStart, SecureConnectStart,
    // SecureConnectEnd, ConnectEnd, ConnectionAcquired, RequestHeadersStart, RequestHeadersEnd,
    // ResponseFailed, ConnectionReleased, CallFailed
    // JDK 8
    // CallStart, ProxySelectStart, ProxySelectEnd, DnsStart, DnsEnd, ConnectStart, SecureConnectStart,
    // ConnectFailed, CallFailed
    // Gradle - JDK 11

          ioe: IOException,
        ) = TODO()

        override fun connectionAcquired(
          call: Call,
          connection: Connection,
        ) = TODO()

        override fun connectionReleased(
          call: Call,
          connection: Connection,
        ) = TODO()

        override fun requestHeadersStart(call: Call) = TODO()

        override fun requestHeadersEnd(

    eventRecorder.removeUpToEvent(ResponseFailed::class.java)
    eventRecorder.removeUpToEvent(ConnectionReleased::class.java)
    eventRecorder.removeUpToEvent(ConnectionAcquired::class.java)
    eventRecorder.removeUpToEvent(ConnectionReleased::class.java)
    eventRecorder.removeUpToEvent(CallEnd::class.java)
  }

  @Test