HTTP -> HTTPS redirect from Amazon's ELB in Go

HttpToHttps.go

import (
	"fmt"
	"net/http"
)

func ServeHTTP(w http.ResponseWriter, r *http.Request) {
	//	HTTP -> HTTPS redirects for Amazon ELB
	//	sniff for X-Forwarded-Proto header
	proto := r.Header.Get("X-Forwarded-Proto")
	//	if our protocol is http, redirect to https
	if proto == "http" {
		//	build the url, keeping the request params
		url := fmt.Sprintf("https://%v%v", r.Host, r.RequestURI)
	
		//	redirect with a 301 permanent
		http.Redirect(w, r, url, http.StatusMovedPermanently)
		return
	}
	
	//	usually I call mux.ServeHTTP(w, r) here
	return
}