A short Go program to serve arbitrary HTTPS certificates for testing

serve-cert.go

package main

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

func handler(w http.ResponseWriter, req *http.Request) {
	w.Header().Set("Content-Type", "text/plain")
	w.Write([]byte("42.\n"))
}

func main() {
	http.HandleFunc("/", handler)
	log.Printf("About to listen on 127.0.0.1:10443")
	err := http.ListenAndServeTLS("127.0.0.1:10443", os.Args[1], os.Args[2], nil)
	if err != nil {
		log.Fatal(err)
	}
}