document's age at the time it was served based on "Last-Modified". Default expiration dates aren't used for URIs
containing a query.

 - CallStart
 - **CacheHit**
 - CallEnd

### Cache Miss

Under a cache miss the normal request events are seen but an additional event shows the presence of the cache.

    Thread.sleep(10) // Make sure the timestamps are unique.
    val cacheHit =
      executeSynchronously(
        "/",
        "Accept-Language",
        "en-US",
        "Accept-Charset",
        "UTF-8",
      )

    // Check the merged response. The request is the application's original request.
    cacheHit
      .assertCode(200)
      .assertBody("A")
      .assertHeaders(

	public static final field NONE Lokhttp3/EventListener;
	public fun <init> ()V
	public fun cacheConditionalHit (Lokhttp3/Call;Lokhttp3/Response;)V
	public fun cacheHit (Lokhttp3/Call;Lokhttp3/Response;)V
	public fun cacheMiss (Lokhttp3/Call;)V
	public fun callEnd (Lokhttp3/Call;)V
	public fun callFailed (Lokhttp3/Call;Ljava/io/IOException;)V
	public fun callStart (Lokhttp3/Call;)V

	public static final field NONE Lokhttp3/EventListener;
	public fun <init> ()V
	public fun cacheConditionalHit (Lokhttp3/Call;Lokhttp3/Response;)V
	public fun cacheHit (Lokhttp3/Call;Lokhttp3/Response;)V
	public fun cacheMiss (Lokhttp3/Call;)V
	public fun callEnd (Lokhttp3/Call;)V
	public fun callFailed (Lokhttp3/Call;Ljava/io/IOException;)V
	public fun callStart (Lokhttp3/Call;)V