golang CORS allowed http server with static file serve

README.md

run it via

go run main.go from the directory you want to server static files from .

main.go

package main

import (
	"net/http"
)

func corsMiddleware(next http.Handler) http.Handler {
	headers := "*"
	methods := "*"
	origins := "*"
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", origins)
		w.Header().Set("Access-Control-Allow-Methods", methods)
		w.Header().Set("Access-Control-Allow-Headers", headers)
		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}
		next.ServeHTTP(w, r)
	})
}

func main() {
	// Create a new ServeMux
	mux := http.NewServeMux()

	// Serve static files in the current directory
	fs := http.FileServer(http.Dir("."))
	mux.Handle("/", corsMiddleware(fs))

	// Start the server
	err := http.ListenAndServe(":8000", mux)
	if err != nil {
		panic(err)
	}
}