How to redirect HTTP to HTTPS with a golang webserver.

package main import ( "net/http" "log" )

func redirect(w http.ResponseWriter, req *http.Request) { // remove/add not default ports from req.Host target := "https://" + req.Host + req.URL.Path if len(req.URL.RawQuery) > 0 { target += "?" + req.URL.RawQuery } log.Printf("redirect to: %s", target) http.Redirect(w, req, target, // see comments below and consider the codes 308, 302, or 301 http.StatusTemporaryRedirect) }

func index(w http.ResponseWriter, req *http.Request) { // all calls to unknown url paths should return 404 if req.URL.Path != "/" { log.Printf("404: %s", req.URL.String()) http.NotFound(w, req) return } http.ServeFile(w, req, "index.html") }

func main() { // redirect every http request to https go http.ListenAndServe(":80", http.HandlerFunc(redirect)) // serve index (and anything else) as https mux := http.NewServeMux() mux.HandleFunc("/", index) http.ListenAndServeTLS(":443", "cert.pem", "key.pem", mux) }