I am currently developing sites with Django and DRF, where the client requests what format it wants and the server sends it in the format of the clients choice-

I am currently developing sites with Django and DRF, where the client requests what format it wants and the server sends it in the format of the clients choice- a browser would request HTML, in which case the server sends HTML- using htmx. A mobile app might request JSON, or XML or CSV or any other supported format. No need to develop a separate API for web and mobile- its all the same API. DRF makes it very easy. Now, I haven't dug into Apple iOS dev yet, I know they have some artificial limitations on what an app can receive, but thats an Apple limitation, not a technical one. I'm pretty sure Apple allows an iOS app to receive data over the Internet and render that data within the app? I just need to figure out what format it can be sent it for the app to render it.