/**
     * Sets this request's `Cache-Control` header, replacing any cache control headers already
     * present. If [cacheControl] doesn't define any directives, this clears this request's
     * cache-control headers.
     */
    open fun cacheControl(cacheControl: CacheControl): Builder {
      val value = cacheControl.toString()
      return when {
        value.isEmpty() -> removeHeader("Cache-Control")

 * Request request = new Request.Builder()
 *     .cacheControl(new CacheControl.Builder()
 *         .maxStale(365, TimeUnit.DAYS)
 *         .build())
 *     .url("http://publicobject.com/helloworld.txt")
 *     .build();
 * ```
 *
 * The [CacheControl] class can configure request caching directives and parse response caching
 * directives. It even offers convenient constants [CacheControl.FORCE_NETWORK] and

   * response contains no `Cache-Control` header.
   */
  @get:JvmName("cacheControl")
  val cacheControl: CacheControl
    get() {
      var result = lazyCacheControl
      if (result == null) {
        result = CacheControl.parse(headers)
        lazyCacheControl = result
      }
      return result
    }

  @JvmName("-deprecated_cacheControl")

  }

  @Test
  fun cacheControl() {
    val request =
      Request
        .Builder()
        .cacheControl(CacheControl.Builder().noCache().build())
        .url("https://square.com")
        .build()
    assertThat(request.headers("Cache-Control")).containsExactly("no-cache")
    assertThat(request.cacheControl.noCache).isTrue()
  }

  @Test

	public final fun maxStale (ILjava/util/concurrent/TimeUnit;)Lokhttp3/CacheControl$Builder;
	public final fun maxStale-LRDsOJo (J)Lokhttp3/CacheControl$Builder;
	public final fun minFresh (ILjava/util/concurrent/TimeUnit;)Lokhttp3/CacheControl$Builder;
	public final fun minFresh-LRDsOJo (J)Lokhttp3/CacheControl$Builder;
	public final fun noCache ()Lokhttp3/CacheControl$Builder;

	public final fun maxStale (ILjava/util/concurrent/TimeUnit;)Lokhttp3/CacheControl$Builder;
	public final fun maxStale-LRDsOJo (J)Lokhttp3/CacheControl$Builder;
	public final fun minFresh (ILjava/util/concurrent/TimeUnit;)Lokhttp3/CacheControl$Builder;
	public final fun minFresh-LRDsOJo (J)Lokhttp3/CacheControl$Builder;
	public final fun noCache ()Lokhttp3/CacheControl$Builder;

	}

	if !objInfo.Expires.IsZero() {
		w.Header().Set(xhttp.Expires, objInfo.Expires.UTC().Format(http.TimeFormat))
	}

	if objInfo.CacheControl != "" {
		w.Header().Set(xhttp.CacheControl, objInfo.CacheControl)
	}
}

// Validates the preconditions. Returns true if GET/HEAD operation should not proceed.
// Preconditions supported are:
//
//	If-Modified-Since

        .use {
          assertEquals(200, it.code)
          assertNull(it.cacheResponse)
          assertNotNull(it.networkResponse)

          assertEquals(3, it.cacheControl.maxAgeSeconds)
          assertTrue(it.cacheControl.isPublic)
        }

      client
        .newCall(request)
        .execute()
        .use {
          assertEquals(200, it.code)

}

// setEventStreamHeaders to allow proxies to avoid buffering proxy responses
func setEventStreamHeaders(w http.ResponseWriter) {
	w.Header().Set(xhttp.ContentType, "text/event-stream")
	w.Header().Set(xhttp.CacheControl, "no-cache") // nginx to turn off buffering
	w.Header().Set("X-Accel-Buffering", "no")      // nginx to turn off buffering
}

// Write http common headers
func setCommonHeaders(w http.ResponseWriter) {

	ContentEncoding string

	// Date and time at which the object is no longer able to be cached
	Expires time.Time

	// Cache-Control - Specifies caching behavior along the request/reply chain
	CacheControl string

	// Specify object storage class
	StorageClass string

	ReplicationStatusInternal string
	ReplicationStatus         replication.StatusType
	// User-Defined metadata