req, _ := http.NewRequest(http.MethodOptions, s.endPoint, nil)
	req.Header.Set("Origin", "http://foobar.com")
	res, err := s.client.Do(req)
	if err != nil {
		c.Fatal(err)
	}

	for k := range expectedMap {
		if v, ok := res.Header[k]; !ok {
			c.Errorf("Expected key %s missing from %v", k, res.Header)
		} else {
			expectedSet := set.CreateStringSet(expectedMap[k]...)

		// Validate the SSE-C Key set in the header.
		if _, err = crypto.SSEC.UnsealObjectKey(r.Header, objInfo.UserDefined, bucket, object); err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		w.Header().Set(xhttp.AmzServerSideEncryptionCustomerAlgorithm, r.Header.Get(xhttp.AmzServerSideEncryptionCustomerAlgorithm))

func (z *allTierStats) MarshalMsg(b []byte) (o []byte, err error) {
	o = msgp.Require(b, z.Msgsize())
	// map header, size 1
	// string "ts"
	o = append(o, 0x81, 0xa2, 0x74, 0x73)
	o = msgp.AppendMapHeader(o, uint32(len(z.Tiers)))
	for za0001, za0002 := range z.Tiers {
		o = msgp.AppendString(o, za0001)
		// map header, size 3
		// string "ts"
		o = append(o, 0x83, 0xa2, 0x74, 0x73)
		o = msgp.AppendUint64(o, za0002.TotalSize)

		Help:      "Total number of drive timeout errors since server start",
		Type:      counterMetric,
	}
}

func getNodeDriveIOErrorsMD() MetricDescription {
	return MetricDescription{
		Namespace: nodeMetricNamespace,
		Subsystem: driveSubsystem,
		Name:      "errors_ioerror",
		Help:      "Total number of drive I/O errors since server start",
		Type:      counterMetric,
	}
}

func (z BaseOptions) EncodeMsg(en *msgp.Writer) (err error) {
	// map header, size 0
	_ = z
	err = en.Append(0x80)
	if err != nil {
		return
	}
	return
}

// MarshalMsg implements msgp.Marshaler
func (z BaseOptions) MarshalMsg(b []byte) (o []byte, err error) {
	o = msgp.Require(b, z.Msgsize())
	// map header, size 0
	_ = z
	o = append(o, 0x80)
	return
}

	}
	closeReader := func() { obj.Close() }
	reader, err := fn(obj, h, closeReader)
	if err != nil {
		return nil, proxy, err
	}
	reader.ObjInfo = oi.Clone()
	if rs != nil {
		contentSize, err := parseSizeFromContentRange(h)
		if err != nil {
			return nil, proxy, err
		}
		reader.ObjInfo.Size = contentSize
	}

	return reader, proxyResult{Proxy: true}, nil
}

		// To add the bucket replication rule, we fetch the current
		// server configuration, and convert it to minio-go's
		// replication configuration type (by converting to xml and
		// parsing it back), use minio-go's add rule function, and
		// finally convert it back to the server type (again via xml).
		// This is needed as there is no add-rule function in the server
		// yet.

			for _, server := range infoMessage.Servers {
				anonEndpoint := anonAddr(server.Endpoint)
				servers = append(servers, madmin.ServerInfo{
					State:    server.State,
					Endpoint: anonEndpoint,
					Uptime:   server.Uptime,
					Version:  server.Version,
					CommitID: server.CommitID,
					Network:  anonymizeNetwork(server.Network),
					Drives:   anonymizeDrives(server.Disks),

            "uid": "Prometheus"
          },
          "exemplar": true,
          "expr": "minio_usage_last_activity_nano_seconds{job=\"$scrape_jobs\"}",
          "interval": "1m",
          "legendFormat": "{{server}}",
          "refId": "A"
        }
      ],
      "title": "Time Elapsed Since Last Scan (nanos)",
      "type": "timeseries"
    },
    {
      "datasource": {

			req.Header.Set("X-Amz-Copy-Source-If-Unmodified-Since", testCase.copyUnmodifiedHeader)
		}
		// Add custom metadata.
		for k, v := range testCase.metadata {
			req.Header.Set(k, v)
		}
		if testCase.metadataReplace {
			req.Header.Set("X-Amz-Metadata-Directive", "REPLACE")
		}
		if testCase.metadataCopy {
			req.Header.Set("X-Amz-Metadata-Directive", "COPY")
		}
		if testCase.metadataGarbage {