// high memory usage!
func s3APIMiddleware(f http.HandlerFunc, flags ...s3HFlag) http.HandlerFunc {
	// Collect all flags with bitwise-OR and assign operator
	var handlerFlags s3HFlag
	for _, flag := range flags {
		handlerFlags |= flag
	}

	// Get name of the handler using reflection.
	handlerName := getHandlerName(f, "objectAPIHandlers")

	var handler http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {

		adminRouter.Methods(http.MethodDelete).Path(adminVersion + "/tier/{tier}").HandlerFunc(adminMiddleware(adminAPI.RemoveTierHandler))
		adminRouter.Methods(http.MethodGet).Path(adminVersion + "/tier/{tier}").HandlerFunc(adminMiddleware(adminAPI.VerifyTierHandler))
		// Tier stats

		subrouter.Methods(http.MethodPost).Path("/v1/health").HandlerFunc(lockServer.HealthHandler)
		subrouter.Methods(http.MethodPost).Path("/v1/refresh").HandlerFunc(lockServer.RefreshHandler)
		subrouter.Methods(http.MethodPost).Path("/v1/lock").HandlerFunc(lockServer.LockHandler)
		subrouter.Methods(http.MethodPost).Path("/v1/rlock").HandlerFunc(lockServer.RLockHandler)

		case "HeadObject":
			// Register HeadObject handler.
			bucket.Methods("Head").Path("/{object:.+}").HandlerFunc(api.HeadObjectHandler)
		case "GetObject":
			// Register GetObject handler.
			bucket.Methods(http.MethodGet).Path("/{object:.+}").HandlerFunc(api.GetObjectHandler)
		case "PutObject":

func registerPeerRESTHandlers(router *mux.Router, gm *grid.Manager) {
	h := func(f http.HandlerFunc) http.HandlerFunc {
		return collectInternodeStats(httpTraceHdrs(f))
	}

	server := &peerRESTServer{}
	subrouter := router.PathPrefix(peerRESTPrefix).Subrouter()
	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodHealth).HandlerFunc(h(server.HealthHandler))

			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodVerifyFile).HandlerFunc(h(server.VerifyFileHandler))
			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodStatInfoFile).HandlerFunc(h(server.StatInfoFile))

		noQueries := len(r.URL.RawQuery) == 0
		return ctypeOk && noQueries
	}).HandlerFunc(httpTraceAll(sts.AssumeRoleWithSSO))

	// AssumeRoleWithClientGrants
	stsRouter.Methods(http.MethodPost).HandlerFunc(httpTraceAll(sts.AssumeRoleWithClientGrants)).
		Queries(stsAction, clientGrants).
		Queries(stsVersion, stsAPIVersion).
		Queries(stsToken, "{Token:.*}")

		}
	}
	return false
}

// Limits body and header to specific allowed maximum limits as per S3/MinIO API requirements.
func setRequestLimitMiddleware(h http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)

		// Reject unsupported reserved metadata first before validation.

		if enc != streamingContentEncoding {
			newEncs = append(newEncs, enc)
		}
	}
	return strings.Join(newEncs, ",")
}

func collectInternodeStats(f http.HandlerFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		f.ServeHTTP(w, r)

		tc, ok := r.Context().Value(mcontext.ContextTraceKey).(*mcontext.TraceCtxt)
		if !ok || tc == nil {
			return
		}

					Name:   mg.MetricFQN(d.Name),
					Help:   d.Help,
					Type:   d.Type.String(),
					Labels: labels,
				}
				metrics = append(metrics, metric)
			}
		}
	}

	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		contentType := r.Header.Get("Content-Type")
		if contentType == "application/json" {
			w.Header().Set("Content-Type", "application/json")