An easy way to serve static websites via HTTP with new Go io/fs package.

iofswebsite.go

package main

import (
	"embed"
	"errors"
	"io/fs"
	"log"
	"net/http"
	"strings"
)

//go:embed website
var static embed.FS

type htmlStripperFS struct{ underlying fs.FS }

func (hs *htmlStripperFS) Open(name string) (fs.File, error) {
	f, err := hs.underlying.Open(name)
	if err != nil && errors.Is(err, fs.ErrNotExist) && !strings.HasSuffix(name, ".html") {
		f, err = hs.underlying.Open(name + ".html")
	}
	return f, err
}

func run() error {
	// Serve static files from the /website embedded directory.
	ws, err := fs.Sub(fs.FS(static), "website")
	if err != nil {
		return err
	}
	http.Handle("/", http.FileServer(http.FS(&htmlStripperFS{ws})))
	return http.ListenAndServe(":8080", nil)
}

func main() {
	if err := run(); err != nil {
		log.Fatalf("error in run(): %v", err)
	}
}