拓冰网站优化 
获取网址的根证书openssl s_client -connect github.com:443 -servername github.com /dev/null 2/dev/null | openssl x509 -text -noout获取ip的根证书openssl s_client -connect ip:443 /dev/null 2/dev/null | openssl x509 -text -noout 获取服务器证书的命令
获取网址的根证书openssl s_client -connect github.com:443 -servername github.com /dev/null 2/dev/null | openssl x509 -text -noout获取ip的根证书openssl s_client -connect ip:443 /dev/null 2/dev/null | openssl x509 -text -noout