handle assets and requests_pathname_prefix

So I currently have an API Gateway serving my Dash app under the /dev/ base path.
I have specified my Dash.dash app with

app.config.update({
    # as the proxy server will remove the prefix
    "routes_pathname_prefix": "/", 
    # the front-end will prefix this string to the requests
    # that are made to the proxy server
    'requests_pathname_prefix': '/dev/'
})

and most the app renders fine however, I noticed that the files in my assets directory are not being found since when the app loads, its looking in /assets/ instead of /dev/assets.

This seems like a quick fix on my part, but I'm not sure where to start since this library is so new to me.

Inizia riproducendo l'app Dash dietro un API Gateway al percorso di base /dev/ usando le impostazioni mostrate routes_pathname_prefix e requests_pathname_prefix. Traccia il modo in cui vengono generati gli URL della directory assets e verifica che le richieste agli asset usino /dev/assets, mentre il comportamento esistente del percorso radice rimanga corretto.