Simple Static File Server in Go

serve.go

/*
Serve is a very simple static file server in go
Usage:
	-p="8100": port to serve on
	-d=".":    the directory of static files to host

Navigating to http://localhost:8100 will display the index.html or directory
listing file.
*/
package main

import (
	"flag"
	"log"
	"net/http"
)

func main() {
	port := flag.String("p", "8100", "port to serve on")
	directory := flag.String("d", ".", "the directory of static file to host")
	flag.Parse()

	http.Handle("/", http.FileServer(http.Dir(*directory)))

	log.Printf("Serving %s on HTTP port: %s\n", *directory, *port)
	log.Fatal(http.ListenAndServe(":"+*port, nil))
}

Thanks a lot, This is great! @paulmach

Thanks!

Does anybody happen to know why browsers try to display the old directory listing, even though the server is now launched from a different directory?

It's the same on my firefox on Linux machine and chrome on my android. If I reopen the page it'll show the old listing, even though it gets 404 if files are accessed. If I open in incognito or new browser, everything is fine and the new listing is loaded.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control

example for cors, need to adjust for your need (cache, implementation)

package main

import "net/http"

func addCORS(next http.Handler) http.Handler {
  return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
    w.Header().Set("Cross-Origin-Embedder-Policy", "require-corp")
    w.Header().Set("Cross-Origin-Opener-Policy", "same-origin")
    next.ServeHTTP(w, req)
  })
}

func main() {
  port := ":9999"
  handler := addCORS(http.FileServer(http.Dir("files")))
  http.ListenAndServe(port, handler)
}