if globalEndpoints.Legacy() {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
		return
	}

	z, ok := objectAPI.(*erasureServerPools)
	if !ok || len(z.serverPools) == 1 {
		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL)
		return
	}

	if z.IsDecommissionRunning() {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, errDecommissionAlreadyRunning), r.URL)

	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	content, err := downloadReleaseURL(u, updateTimeout, mode)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	sha256Sum, lrTime, releaseInfo, err := parseReleaseData(content)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)

	if err := parseJSONBody(ctx, r.Body, &sites, cred.SecretKey); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	opts := getSRAddOptions(r)
	status, err := globalSiteReplicationSys.AddPeerClusters(ctx, sites, opts)
	if err != nil {
		adminLogIf(ctx, err)
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	body, err := json.Marshal(status)

	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	cfg, err := readServerConfig(ctx, objectAPI, nil)
	if err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

	if err = cfg.DelFrom(bytes.NewReader(kvBytes)); err != nil {
		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
		return
	}

		if ok {
			tc.FuncName = "handler.MetricsLegacy"
			tc.ResponseRecorder.LogErrBody = true
		}

		mfs, err := gatherers.Gather()
		if err != nil {
			if len(mfs) == 0 {
				writeErrorResponseJSON(r.Context(), w, toAdminAPIErr(r.Context(), err), r.URL)
				return
			}
		}

		contentType := expfmt.Negotiate(r.Header)
		w.Header().Set("Content-Type", string(contentType))

	// Generate string error response.
	writeResponse(w, err.HTTPStatusCode, []byte(err.Description), mimeNone)
}

// writeErrorResponseJSON - writes error response in JSON format;
// useful for admin APIs.
func writeErrorResponseJSON(ctx context.Context, w http.ResponseWriter, err APIError, reqURL *url.URL) {
	// Generate error response.

		default:
			desc = fmt.Sprintf("Unexpected client 'admin' API version found '%s', expected '%s', please downgrade the client to older releases", version, madmin.AdminAPIVersion)
		}
		writeErrorResponseJSON(r.Context(), w, APIError{
			Code:           "XMinioAdminVersionMismatch",
			Description:    desc,
			HTTPStatusCode: http.StatusUpgradeRequired,
		}, r.URL)
	default:

		// Check if object layer is available, if not return error early.
		if !handlerFlags.Has(noObjLayerFlag) {
			objectAPI := newObjectLayerFn()
			if objectAPI == nil || globalNotificationSys == nil {
				writeErrorResponseJSON(r.Context(), w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
				return
			}
		}

		// Apply http tracing "middleware" based on presence of flag.
		var f2 http.HandlerFunc

		if ok {
			tc.FuncName = funcName
			tc.ResponseRecorder.LogErrBody = true
		}

		mfs, err := gatherers.Gather()
		if err != nil && len(mfs) == 0 {
			writeErrorResponseJSON(r.Context(), w, toAdminAPIErr(r.Context(), err), r.URL)
			return
		}

		contentType := expfmt.Negotiate(r.Header)
		w.Header().Set("Content-Type", string(contentType))