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# Custom Request and APIRoute class { #custom-request-and-apiroute-class }

In some cases, you may want to override the logic used by the `Request` and `APIRoute` classes.

In particular, this may be a good alternative to logic in a middleware.

For example, if you want to read or manipulate the request body before it is processed by your application.

/// danger

This is an "advanced" feature.

If you want to use your APIs' function names as `operationId`s, you can iterate over all of them and override each *path operation's* `operation_id` using their `APIRoute.name`.

You should do it after adding all your *path operations*.

{* ../../docs_src/path_operation_advanced_configuration/tutorial002.py hl[2, 12:21, 24] *}

/// tip

FastAPI uses a **unique ID** for each *path operation*, which is used for the **operation ID** and also for the names of any needed custom models, for requests or responses.

You can customize that function. It takes an `APIRoute` and outputs a string.

For example, here it is using the first tag (you will probably have only one tag) and the *path operation* name (the function name).

Sie können diese Funktion anpassen. Sie nimmt eine `APIRoute` und gibt einen String zurück.

Hier verwendet sie beispielsweise den ersten Tag (Sie werden wahrscheinlich nur einen Tag haben) und den Namen der *Pfadoperation* (den Funktionsnamen).

FastAPI usa un **ID único** para cada *path operation*, se usa para el **operation ID** y también para los nombres de cualquier modelo personalizado necesario, para requests o responses.

Puedes personalizar esa función. Toma un `APIRoute` y retorna un string.

Por ejemplo, aquí está usando el primer tag (probablemente tendrás solo un tag) y el nombre de la *path operation* (el nombre de la función).

Você pode personalizar essa função. Ela recebe uma `APIRoute` e gera uma string.

Por exemplo, aqui está usando a primeira tag (você provavelmente terá apenas uma tag) e o nome da *operação de rota* (o nome da função).

    * If you have advanced custom logic to access each route's `route.response_class`, or the `router.default_response_class`, or the `app.default_response_class`: the default value for `response_class` in `APIRoute` and for `default_response_class` in `APIRouter` and `FastAPI` is now a `DefaultPlaceholder` used internally to handle and solve default values and overrides. The actual response class inside the `DefaultPlaceholder` is available at `route.response_class.value`....