For local development do you run two servers, next and asp and then for dynamic api calls by the client do you proxy the request through next or go directly to

For local development do you run two servers, next and asp and then for dynamic api calls by the client do you proxy the request through next or go directly to the asp server by its port number? Similarly in production do you use a reverse proxy for the asp server so that requests to like /api go to the asp server?