I know :) but since the go tool is already installed and having the facility available by default on node and python, I thought maybe I had missed something.
It was between using npx serve . or using go and having to find a package or write the lines myself.
Just to check a html file that could not run in file mode.
Anyway, I kept my braincells activity for some other stuff... Seems to work still
https://github.com/atdiar/fsrv**oops I think I've deleted my previous response, saying that basically ruling it out of scope made sense, and that the rationale was avoiding third party package that might be changed under people's feet**