Golang实现http重定向https

//main.go
package main
import (
	"fmt"
	"io"
	"net/http"
)
func defaultHandler(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, "<h1>Golang HTTP</h1>")
}
func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", defaultHandler)
	err := http.ListenAndServe(":80", mux)
	if err != nil {
		fmt.Println(err.Error())
	}
}

//main.go
package main
import (
	"fmt"
	"io"
	"net/http"
)
func defaultHandler(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, "<h1>Golang HTTPS</h1>")
}
func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/", defaultHandler)
	certFile := "/etc/letsencrypt/live/www.taadis.com/cert.pem"
	keyFile := "/etc/letsencrypt/live/www.taadis.com/privkey.pem"
	err := http.ListenAndServeTLS(":443", certFile, keyFile, mux)
	if err != nil {
		fmt.Println(err.Error())
	}
}