Golang获取https证书信息与过期信息

package main
import (
    "crypto/tls"
    "fmt"
    "net/http"
)
func main() {
    tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
    }
    client := &http.Client{Transport: tr}
    seedUrl := "https://richerdyoung.com"
    resp, err := client.Get(seedUrl)
    defer resp.Body.Close()
    if err != nil {
        fmt.Errorf(seedUrl," 请求失败")
        panic(err)
    }
    //fmt.Println(resp.TLS.PeerCertificates[0])
    certInfo:=resp.TLS.PeerCertificates[0]
    fmt.Println("过期时间:",certInfo.NotAfter)
    fmt.Println("组织信息:",certInfo.Subject)
}