Server for HTTP protocol. Redirects all requests to HTTPS.

main.go

// Server for HTTP protocol. Redirects all requests to HTTPS.
package main

import (
	"flag"
	"log"
	"net/http"
)

var (
	httpFlag = flag.String("http", ":http", "Listen for HTTP connections on this address.")
)

func main() {
	flag.Parse()

	err := http.ListenAndServe(*httpFlag, httpToHTTPSRedirector{})
	if err != nil {
		log.Fatalln(err)
	}
}

// httpToHTTPSRedirector redirects all requests from http to https.
type httpToHTTPSRedirector struct{}

func (httpToHTTPSRedirector) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	u := *req.URL
	u.Scheme = "https"
	u.Host = req.Host
	/* TODO: Figure out if I should do this, and if this is the best way.
	req.Header.Set("Connection", "close")
	req.Close = true*/
	// TODO: Should this be changed to http.StatusMovedPermanently?
	http.Redirect(w, req, u.String(), http.StatusTemporaryRedirect)
}

L27 is clever; for some reason, dereferencing the URL never occurred to me, but it seems useful!