Behind a custom domain name

[ohad-griiip]

I have a fastapi app deployed as a lambda using mangum.
I set the root_path as the stage in api gateway so that the /openapi.json and /docs work correctly.

🐼 My problem is when I do custom domain mapping and put this app under a dns.
So I have a mapping like:

/api/v1/appname ➡️ app

The app is forwarded requests with the mapping prefix which causes a problem.
I've now discovered the api_gateway_base_path which solves this but I'm still having a problem displaying the /docs since it looks up the openapi.json at ROOT_PATH/openapi.json.

I'm not sure if it's fastapi or here but help here would be very appreciated ✨