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@d-schmidt
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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)
}
@AneudyM
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AneudyM commented Mar 30, 2018

You could also use the url package to construct the URL as well:

targetUrl := url.URL{ Scheme: "https", Host: r.Host, Path: r.URL.Path, RawQuery: r.URL.RawQuery, }

@MakotoE
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MakotoE commented Aug 15, 2019

Shouldn't you use http.StatusPermanentRedirect (308) as the status code for redirect, not http.StatusTemporaryRedirect (307), because you're probably not going to create an unsecure http route in the future?

@d-schmidt
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Author

d-schmidt commented Aug 18, 2019

@MakotoE you are probably right. I will add a another comment

@pystub
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pystub commented Nov 29, 2021

@drstearns it flops on ipv6 addresses.

This is what I came up with:

d := r.Host
if m, _ := regexp.MatchString(`:\d+$`, d); m {
	d = d[:strings.LastIndexByte(d, ':')]
}

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