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*** https://acme-v01.api.letsencrypt.org/directory
*** https://acme-v01.api.letsencrypt.org/acme/new-reg
2020/06/21 00:16:52 http: TLS handshake error from 23.241.207.246:58899: 403 urn:acme:error:unauthorized: Account creation on ACMEv1 is disabled. Please upgrade your ACME client to a version that supports ACMEv2 / RFC 8555. See https://community.letsencrypt.org/t/end-of-life-plan-for-acmev1/88430 for details.
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2020/06/21 00:16:52 http: TLS handshake error from 23.241.207.246:58900: acme/autocert: missing certificate

package main

import (
	"crypto/tls"
	"net/http"

	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/acme/autocert"
)

func main() {

	router := gin.Default()
	hosts := []string{"yourdomain.com"}
	certManager := autocert.Manager{
		Prompt:     autocert.AcceptTOS,
		HostPolicy: autocert.HostWhitelist(hosts...),
		Cache:      autocert.DirCache("/certs"),
	}

	server := &http.Server{
		Addr:    ":https",
		Handler: router,
		TLSConfig: &tls.Config{
			GetCertificate: certManager.GetCertificate,
		},
	}

	server.ListenAndServeTLS("", "")
}