Go를 사용하여 HTTPS 요청에서 서버 인증서를 어떻게 확인할 수 있나요?

tr := &http.Transport{
    TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}

client := &http.Client{Transport: tr}

package main

import (
    "crypto/tls"
    "io/ioutil"
    "log"
    "net/http"
    "crypto/x509"
)

func main() {
    caCert, err := ioutil.ReadFile("rootCA.crt")
    if err != nil {
        log.Fatal(err)
    }
    caCertPool := x509.NewCertPool()
    caCertPool.AppendCertsFromPEM(caCert)

    client := &http.Client{
        Transport: &http.Transport{
            TLSClientConfig: &tls.Config{
                RootCAs:      caCertPool,
            },
        },
    }

    _, err := client.Get("https://secure.domain.com")
    if err != nil {
        panic(err)
    }
}

openssl genrsa -out rootCA.key 4096
openssl req -x509 -new -key rootCA.key -days 3650 -out rootCA.crt

openssl genrsa -out secure.domain.com.key 2048
openssl req -new -key secure.domain.com.key -out secure.domain.com.csr
# In answer to question `Common Name (e.g. server FQDN or YOUR name) []:` you should set `secure.domain.com` (your real domain name)
openssl x509 -req -in secure.domain.com.csr -CA rootCA.crt -CAkey rootCA.key -CAcreateserial -days 365 -out secure.domain.com.crt