*/
  @get:JvmName("cacheControl")
  val cacheControl: CacheControl
    get() = commonCacheControl

  @JvmName("-deprecated_cacheControl")
  @Deprecated(
    message = "moved to val",
    replaceWith = ReplaceWith(expression = "cacheControl"),
    level = DeprecationLevel.ERROR,
  )
  fun cacheControl(): CacheControl = cacheControl

  @JvmName("-deprecated_sentRequestAtMillis")

        // 504 code indicates that the Cache is stale
        val onlyIfCached =
          CacheControl.Builder()
            .onlyIfCached()
            .build()

        var cacheUrl = request.url

        val cacheRequest =
          request.newBuilder()
            .cacheControl(onlyIfCached)
            .cacheUrlOverride(cacheUrl)
            .build()

	}

	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

}

// 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) {

	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

			z.Expires, bts, err = msgp.ReadTimeBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "Expires")
				return
			}
		case "CacheControl":
			z.CacheControl, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {
				err = msgp.WrapError(err, "CacheControl")
				return
			}
		case "StorageClass":
			z.StorageClass, bts, err = msgp.ReadStringBytes(bts)
			if err != nil {

	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

		xhttp.AcceptRanges,
		xhttp.ContentRange,
		xhttp.ContentEncoding,
		xhttp.ContentLength,
		xhttp.ContentType,
		xhttp.ContentDisposition,
		xhttp.LastModified,
		xhttp.ContentLanguage,
		xhttp.CacheControl,
		xhttp.RetryAfter,
		xhttp.AmzBucketRegion,
		xhttp.Expires,
		"X-Amz*",
		"x-amz*",
		"*",
	}
	opts := cors.Options{
		AllowOriginFunc: func(origin string) bool {

		Legacy:           fi.XLV1,
		ContentType:      fi.Metadata["content-type"],
		ContentEncoding:  fi.Metadata["content-encoding"],
		NumVersions:      fi.NumVersions,
		SuccessorModTime: fi.SuccessorModTime,
		CacheControl:     fi.Metadata["cache-control"],
	}

	if exp, ok := fi.Metadata["expires"]; ok {
		if t, err := amztime.ParseHeader(exp); err == nil {
			objInfo.Expires = t.UTC()
		}
	}

		putOpts.ContentLanguage = lang
	}
	if disp, ok := lkMap.Lookup(xhttp.ContentDisposition); ok {
		putOpts.ContentDisposition = disp
	}
	if cc, ok := lkMap.Lookup(xhttp.CacheControl); ok {
		putOpts.CacheControl = cc
	}
	if mode, ok := lkMap.Lookup(xhttp.AmzObjectLockMode); ok {
		rmode := minio.RetentionMode(mode)
		putOpts.Mode = rmode
	}