要检查 google.com 的证书是否已被吊销，我尝试了以下命令：
curl https://www.google.com --cacert GeoTrust_Global_CA.pem --crlfile gtglobal.pem -v
，但我遇到了可怕的“SSL 证书问题”错误：
* About to connect() to www.google.com port 443 (#0)
* Trying 81.24.29.91... connected
* successfully set certificate verify locations:
* CAfile: GeoTrust_Global_CA.pem
CApath: /etc/ssl/certs
* successfully load CRL file:
* CRLfile: gtglobal.pem
* SSLv3, TLS handshake, Client hello (1):
* SSLv3, TLS handshake, Server hello (2):
* SSLv3, TLS handshake, CERT (11):
* SSLv3, TLS alert, Server hello (2):
* SSL certificate problem, verify that the CA cert …