$ go run ./cmd/cert/main.go example.com
DomainName: example.com
IP:         2606:2800:220:1:248:1893:25c8:1946
Issuer:     DigiCert TLS RSA SHA256 2020 CA1
NotBefore:  2022-03-14 09:00:00 +0900 JST
NotAfter:   2023-03-15 08:59:59 +0900 JST
CommonName: www.example.org
SANs:       [www.example.org example.net example.edu example.com example.org www.example.com www.example.edu www.example.net]
Error:


$ go run ./cmd/cert/main.go https://example.com
u.Host: example.com
DomainName: example.com
IP:         93.184.216.34
Issuer:     DigiCert TLS RSA SHA256 2020 CA1
NotBefore:  2022-03-14 09:00:00 +0900 JST
NotAfter:   2023-03-15 08:59:59 +0900 JST
CommonName: www.example.org
SANs:       [www.example.org example.net example.edu example.com example.org www.example.com www.example.edu www.example.net]
Error:


$