How do I rewrite / redirect from http to https in Go?

Question

I have put up TLS and it works. I know how to rewrite from http to https in nginx, but I do not use nginx anymore. I don't know how to do this in Go properly.

func main() {

    certificate := "/srv/ssl/ssl-bundle.crt"
    privateKey := "/srv/ssl/mykey.key"

    http.HandleFunc("/", rootHander)
    // log.Fatal(http.ListenAndServe(":80", nil))
    log.Fatal(http.ListenAndServeTLS(":443", certificate, privateKey, nil))
}

func rootHander(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("To the moon!"))
}

How would I do this in a good way?

Answer 1

Create a handler which handles redirection to https like:

func redirectTLS(w http.ResponseWriter, r *http.Request) {
    http.Redirect(w, r, "https://IPAddr:443"+r.RequestURI, http.StatusMovedPermanently)
}

Then redirect http traffic:

go func() {
    if err := http.ListenAndServe(":80", http.HandlerFunc(redirectTLS)); err != nil {
        log.Fatalf("ListenAndServe error: %v", err)
    }
}()