Try this!

1. install golang 1.16-beta1
2. clone this repo
3. run go1.16beta1 run main.go
4. open localhost:8083
5. see the contents of hello.txt served

Sadly because the file is embeded at compile time(1) changes to the file won't be reflected in the server response; the service must be restarted on file changes.

(1) needs citation