* 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")

 * 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

	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;

  }

  @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

   readTimeoutMillis, retryOnConnectionFailure, socketFactory, sslSocketFactory, writeTimeoutMillis
 * **PushPromise**: headers, method, path, response
 * **Request**: body, cacheControl, headers, method, url
 * **Response**: body, cacheControl, cacheResponse, code, handshake, headers, message,
   networkResponse, priorResponse, protocol, receivedResponseAtMillis, request, sentRequestAtMillis
 * **Route**: address, proxy, socketAddress

	}

	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) {

##### Changes

 * New: Support for `HTTP-draft-09/2.0`.
 * New: Support for `spdy/3.1`. Dropped support for `spdy/3`.
 * New: Use ALPN on Android platforms that support it (4.4+)
 * New: CacheControl model and parser.
 * New: Protocol selection in MockWebServer.
 * Fix: Route selection shouldn't use TLS modes that we know will fail.
 * Fix: Cache SPDY responses even if the response body is closed prematurely.

	Connection         = "Connection"
	AcceptRanges       = "Accept-Ranges"
	AmzBucketRegion    = "X-Amz-Bucket-Region"
	ServerInfo         = "Server"
	RetryAfter         = "Retry-After"
	Location           = "Location"
	CacheControl       = "Cache-Control"
	ContentDisposition = "Content-Disposition"
	Authorization      = "Authorization"
	Action             = "Action"
	Range              = "Range"
)

// Non standard S3 HTTP response constants