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.

Beginne damit, die Dash-App hinter einem API Gateway am Basispfad /dev/ anhand der gezeigten Einstellungen routes_pathname_prefix und requests_pathname_prefix nachzubilden. Verfolge, wie die URLs für das assets-Verzeichnis generiert werden, und überprüfe, dass Asset-Anfragen /dev/assets verwenden, während das bestehende Verhalten für den Root-Pfad korrekt bleibt.