What your code does is when you access localhost:8080/h, it will serve the
contents of the file ./data/h
If ./data/h does not exist, it will give a 404.
If ./data/h is a directory, it will redirect to /h/ - but then there's no
route which matches that path, so after following the redirect you'll get a
404.
Note that "/h" only matches the path /h - if you want a subtree you need
the trailing slash.
If you changed it to:
http.Handle("/h/", http.FileServer(http.Dir("./data")))
log.Fatal(http.ListenAndServe(":8080", nil))
then you'll find
curl localhost:8080/h/xxx
shows you the contents of data/h/xxx
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