package main import ( "flag" "log" "net/http" ) const html = `

Simple CORS

` func main() { addr := flag.String("addr", ":9000", "Server address") flag.Parse() log.Printf("Starting server on %s", *addr) err := http.ListenAndServe(*addr, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.Write([]byte(html)) })) log.Fatal(err) }