Ask HN: Impossible to serve web page over blueooth?

I want to have a local device that will serve web apps to my Android browser over bluetooth or wifi *while my Android is still connected to normal wifi or mobile data*.

I have thought about trying local http proxies over bluetooth serial, the new web bluetooth standards, intercepting xhr in native Android code to send requests over serial, wifi direct, wifi regular mode but w/o route to internet, serving the app over lte so my android connects to it through the internet.

All of these are brittle hacks that have unintended consequences (e.g. can connect to wifi regular mode w/o default gateway but then it only connects to lte, web bluetooth isn't a request/response model, have to build framing to proxy multiple requests over bluetooth serial).

Has anyone done this and it worked??