loading certificate !

	rootMux := http.NewServeMux()
	cfg := &tls.Config{}

	cert, err := tls.LoadX509KeyPair("fullchain.pem", "/privkey.pem")
	if err != nil {
		panic(err)
	}

	cfg.Certificates = append(cfg.Certificates, cert)

	cert2, err2 := tls.LoadX509KeyPair("fullchain2.pem", "/privkey2.pem")
	if err2 != nil {
		panic(err2)
	}

	cfg.Certificates = append(cfg.Certificates, cert2)

	cfg.BuildNameToCertificate()

	server := http.Server{
		Addr:      ":443",
		Handler:   rootMux,
		TLSConfig: cfg,
	}

	err = server.ListenAndServeTLS("", "")
	if err != nil {
		panic(err)
	}