// write error response only if no data or headers has been written to client yet
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		return
	}

	if err = httpWriter.Close(); err != nil {
		if !httpWriter.HasWritten() && !statusCodeWritten { // write error response only if no data or headers has been written to client yet
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)

// and If-Unmodified-Since headers set are validated.
// If-Modified-Since - Return the object only if it has been modified since the specified time, else return a 304 (not modified).
// If-Unmodified-Since - Return the object only if it has not been modified since the specified time, else return a 412 (precondition failed).
func (s *TestSuiteCommon) TestHeadOnObjectLastModified(c *check) {

		})
		metrics = append(metrics, MetricV2{
			Description: MetricDescription{
				Namespace: clusterMetricNamespace,
				Subsystem: kmsSubsystem,
				Name:      kmsUptime,
				Help:      "The time the KMS has been up and running in seconds.",
				Type:      counterMetric,
			},
			Value: metric.UpTime.Seconds(),
		})

		return metrics
	})
	return mg
}

// using the local cluster's root credential.
func (c *SiteReplicationSys) IAMChangeHook(ctx context.Context, item madmin.SRIAMItem) error {
	// The IAM item has already been applied to the local cluster at this
	// point, and only needs to be updated on all remote peer clusters.

	c.RLock()
	defer c.RUnlock()
	if !c.enabled {
		return nil
	}

				// 503 encountered while updating metadata - make sure to set ReplicationStatus
				// as Completed.
				//
				// Note: Replication Stats would have been updated despite metadata update failure.
				rinfo.ReplicationAction = rAction
				rinfo.ReplicationStatus = replication.Completed
			}
			return
		}
	} else {

        "maxVizHeight": 300,
        "minVizHeight": 10,
        "minVizWidth": 0,
        "namePlacement": "auto",
        "orientation": "horizontal",
        "reduceOptions": {
          "calcs": [
            "mean"
          ],
          "fields": "",
          "values": false
        },
        "showUnfilled": false,
        "sizing": "auto",
        "text": {},
        "valueMode": "color"
      },

	totalRx := int64(0)
	connectTime := time.Now()
	for {
		n, err := io.CopyN(xioutil.Discard, r.Body, 128*humanize.KiByte)
		if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
			// would mean the network is not stable. Logging here will help in debugging network issues.
			if time.Since(connectTime) < (globalNetPerfMinDuration - time.Second) {
				adminLogIf(ctx, err)
			}
		}
		totalRx += n

			t.Fatalf("Test %d: %s:  Expected the response status to be `%d`, but instead found `%d`", i+1, instanceType, testCase.expectedRespStatus, rec.Code)
		}
		if rec.Code == http.StatusOK {
			// See if the new part has been uploaded.
			// testing whether the copy was successful.
			var results ListPartsInfo
			results, err = obj.ListObjectParts(context.Background(), testCase.bucketName, testObject, testCase.uploadID, 0, 1, ObjectOptions{})