state.router_shutdown = True

    sub_router = APIRouter()

    @sub_router.on_event("startup")
    def sub_router_startup() -> None:
        state.sub_router_startup = True

    @sub_router.on_event("shutdown")
    def sub_router_shutdown() -> None:
        state.sub_router_shutdown = True

    router.include_router(sub_router)
    app.include_router(router)

        return item1, item2  # pragma: nocover

    @sub_router.post(
        "/subrouter",
        response_model=List[Item],
        responses={404: {"model": List[Message]}},
    )
    def post_subrouter(item1: Item, item2: Item):
        return item1, item2  # pragma: nocover

    router.include_router(sub_router)
    app.include_router(router, generate_unique_id_function=custom_generate_unique_id3)

## Handlers & Routes

Handlers have a predefined Handler ID. 
In addition, there can be several *static* subroutes used to differentiate between different handlers of the same ID.
A subroute on a client must match a subroute on the server. So routes cannot be used for dynamic routing, unlike HTTP.

// []byte -> ([]byte, error) requests.
// subroutes are joined with "/" to a single subroute.
func (m *Manager) RegisterSingleHandler(id HandlerID, h SingleHandlerFn, subroute ...string) error {
	if !id.valid() {
		return ErrUnknownHandler
	}
	s := strings.Join(subroute, "/")
	if debugPrint {
		fmt.Println("RegisterSingleHandler: ", id.String(), "subroute:", s)
	}

	if len(subroute) == 0 {

				endpoint: endpoint,
			}

			subrouter := router.PathPrefix(path.Join(storageRESTPrefix, endpoint.Path)).Subrouter()

			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodHealth).HandlerFunc(h(server.HealthHandler))
			subrouter.Methods(http.MethodPost).Path(storageRESTVersionPrefix + storageRESTMethodAppendFile).HandlerFunc(h(server.AppendFileHandler))

		return collectInternodeStats(httpTraceHdrs(f))
	}

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

	}
	return c
}

// Subroute returns a static subroute for the connection.
func (c *Connection) Subroute(s string) *Subroute {
	if c == nil {
		return nil
	}
	return &Subroute{
		Connection: c,
		route:      s,
		subID:      makeSubHandlerID(0, s),
		trace:      c.trace.subroute(s),
	}
}

// Subroute adds a subroute to the subroute.
// The subroutes are combined with '/'.

		TraceType: madmin.TraceInternal,
		Prefix:    "grid",
		Local:     c.Local,
		Remote:    c.Remote,
		Subroute:  "",
	}
}

// subroute adds a specific subroute to the request.
func (c *tracer) subroute(subroute string) *tracer {
	if c == nil {
		return nil
	}
	c2 := *c
	c2.Subroute = subroute
	return &c2
}

type tracer struct {
	Publisher *pubsub.PubSub[madmin.TraceInfo, madmin.TraceType]

				// to match for `<bucket>`
				return host != minioReservedBucket+"."+domainName
			}).Host("{bucket:.+}."+domainName).Subrouter())
		} else {
			routers = append(routers, apiRouter.Host("{bucket:.+}."+domainName).Subrouter())
		}
	}
	routers = append(routers, apiRouter.PathPrefix("/{bucket}").Subrouter())

	for _, router := range routers {
		// Register all rejected object APIs
		for _, r := range rejectedObjAPIs {

		// Any non-nil error sent as response means no more responses are sent.
		Handle StreamHandlerFn

		// Subroute for handler.
		// Subroute must be static and clients should specify a matching subroute.
		// Should not be set unless there are different handlers for the same HandlerID.
		Subroute string

		// OutCapacity is the output capacity. If <= 0 capacity will be 1.
		OutCapacity int