c.Assert(err, nil)
	// Since the "If-Modified-Since" header was ahead in time compared to the actual
	// modified time of the object expecting the response status to be http.StatusNotModified.
	c.Assert(response.StatusCode, http.StatusOK)
}

// TestHeadOnBucket - Validates response for HEAD on the bucket.
// HEAD request on the bucket validates the existence of the bucket.

		recV2 := httptest.NewRecorder()
		// construct HTTP request for Head Object endpoint.
		reqV2, err := newTestSignedRequestV2(http.MethodHead, getHeadObjectURL("", testCase.bucketName, testCase.objectName),
			0, nil, testCase.accessKey, testCase.secretKey, nil)
		if err != nil {
			t.Fatalf("Test %d: %s: Failed to create HTTP request for Head Object: <ERROR> %v", i+1, instanceType, err)
		}

		writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
		return
	}

	api.getObjectAttributesHandler(ctx, objectAPI, bucket, object, w, r)
}

// HeadObjectHandler - HEAD Object
// -----------
// The HEAD operation retrieves metadata from an object without returning the object itself.
func (api objectAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Request) {
	ctx := newContext(r, w, "HeadObject")

          "interval": "1m",
          "intervalFactor": 2,
          "legendFormat": "{{bucket}}",
          "refId": "A"
        }
      ],
      "title": "Total Proxied Head Requests",
      "type": "timeseries"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${DS_PROMETHEUS}"
      },
      "fieldConfig": {
        "defaults": {

	return MetricDescription{
		Namespace: ns,
		Subsystem: replicationSubsystem,
		Name:      proxiedHeadRequestsTotal,
		Help:      "Number of HEAD requests proxied to replication target",
		Type:      counterMetric,
	}
}

func getClusterReplProxiedPutTaggingOperationsMD(ns MetricNamespace) MetricDescription {
	return MetricDescription{

		case isErrReadQuorum(serr), isErrWriteQuorum(serr):
			rAction = replicateAll
		default:
			rinfo.Err = cerr
			replLogIf(ctx, fmt.Errorf("unable to replicate %s/%s (%s). Target (%s) returned %s error on HEAD",
				bucket, object, objInfo.VersionID, tgt.EndpointURL(), cerr))
			sendEvent(eventArgs{
				EventName:  event.ObjectReplicationNotTracked,
				BucketName: bucket,
				Object:     objInfo,

IAAfALNPktp7bktaO36A/C6mcV/bTdjq5smAvVgerrpbJQp+52Q58BIKzTZpecdiA==","X-Minio-Internal-Server-Side-Encryption-Seal-Algorithm":"DAREv2-HMAC-SHA256","content-type":"application/octet-stream"}},{"Bucket":"buck1","Name":"go_113/src/cmd/internal/objabi/head.go","UserDef":{"X-Minio-Internal-Server-Side-Encryption-Iv":"x6e8oYUJuEblDXZ8l2z2=","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Key-Id":"my-minio-key","X-Minio-Internal-Server-Side-Encryption-S3-Kms-Sealed-Key":"IAAfAMufD9XVbGr5puai/iDcbJ2O3+j...