Generate a self-signed certificate for Go

Use OpenSSL generate a self-signed certificate for Golang. In this code snippet I created a certificate with validity of 15 years.

openssl genrsa -out server.key 2048
openssl req -new -x509 -sha256 -key server.key -out server.crt -days 5475

Once you create the certificate and key you can use it in your Golang HTTP like this

 1package main
 2
 3import (
 4	"log"
 5	"net/http"
 6	"time"
 7
 8	"github.com/julienschmidt/httprouter"
 9)
10
11func main() {
12	router := httprouter.New()
13	router.HandlerFunc(http.MethodGet, "/", func(w http.ResponseWriter, r *http.Request) {
14		w.WriteHeader(200)
15		w.Write([]byte("Hello in TLS"))
16	})
17
18	httpServer := &http.Server{
19		Addr:         ":8080",
20		Handler:      router,
21		ReadTimeout:  120 * time.Second,
22		WriteTimeout: 120 * time.Second,
23	}
24
25	log.Fatal(httpServer.ListenAndServeTLS("server.crt", "server.key")) // <- Listen and serve with TLS
26}