How to do Domain wildcard mapping www.mywebsite.com/{slug} to {slug}.mywebsite.com

[glass sage]

I've figured out how to make .com/{slug} always redirect to the subdomain but I don't want a redirect, just want the option to visit either the subdomain or the path

I'd like to create this mapping, but I also need to test this on a separate deployment before prod, and lastly the ability to conditionally enable/disable this mapping (say only whitelisted slugs or something)

Any help greatly appreciated

[uncut pasture]

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[gloomy isle]

you can check this inside your middleware. Take a look at this example middleware:
https://github.com/vercel/platforms/blob/main/middleware.ts