return

        wrapper = self.receive_wrapper(receive)
        await self.app(scope, wrapper, send)


@router.post("/middleware")
def run_middleware(file: UploadFile = File(..., description="Big File")):
    return {"message": "OK"}


app.include_router(router)
app.add_middleware(ContentSizeLimitMiddleware, max_content_size=2**8)


client = TestClient(app)

///

### Add the callback router { #add-the-callback-router }

At this point you have the *callback path operation(s)* needed (the one(s) that the *external developer*  should implement in the *external API*) in the callback router you created above.

Now use the parameter `callbacks` in *your API's path operation decorator* to pass the attribute `.routes` (that's actually just a `list` of routes/*path operations*) from that callback router:

## Benutzerdefinierte `APIRoute`-Klasse in einem Router { #custom-apiroute-class-in-a-router }

Sie können auch den Parameter `route_class` eines `APIRouter` festlegen:

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

## Пользовательский класс `APIRoute` в роутере { #custom-apiroute-class-in-a-router }

Вы также можете задать параметр `route_class` у `APIRouter`:

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

## Classe `APIRoute` personalizada em um router { #custom-apiroute-class-in-a-router }

Você também pode definir o parâmetro `route_class` de uma `APIRouter`:

{* ../../docs_src/custom_request_and_route/tutorial003_py310.py hl[26] *}

///

### Den Callback-Router hinzufügen { #add-the-callback-router }

An diesem Punkt haben Sie die benötigte(n) *Callback-Pfadoperation(en)* (diejenige(n), die der *externe Entwickler* in der *externen API* implementieren sollte) im Callback-Router, den Sie oben erstellt haben.

	"testing"

	"github.com/minio/mux"
)

// Test cross domain xml handler.
func TestCrossXMLHandler(t *testing.T) {
	// Server initialization.
	router := mux.NewRouter().SkipClean(true).UseEncodedPath()
	handler := setCrossDomainPolicyMiddleware(router)
	srv := httptest.NewServer(handler)

	resp, err := http.Get(srv.URL + crossDomainXMLEntity)
	if err != nil {
		t.Fatal(err)
	}

)

// adminErasureTestBed - encapsulates subsystems that need to be setup for
// admin-handler unit tests.
type adminErasureTestBed struct {
	erasureDirs []string
	objLayer    ObjectLayer
	router      *mux.Router
	done        context.CancelFunc
}

// prepareAdminErasureTestBed - helper function that setups a single-node
// Erasure backend for admin-handler tests.

    assert response.json() == {"foo": "baz"}


def test_nested_router():
    app = FastAPI()

    router = APIRouter(prefix="/nested")

    @router.get("/test")
    async def test(var: Annotated[str, Query()] = "bar"):
        return {"foo": var}

    app.include_router(router)

    client = TestClient(app)

    response = client.get("/nested/test")
    assert response.status_code == 200

///

### Agrega el router de callback { #add-the-callback-router }

En este punto tienes las *path operation(s)* del callback necesarias (las que el *desarrollador externo* debería implementar en la *API externa*) en el router de callback que creaste arriba.