echo "GET https://mail.test.com/EWS/Exchange.asmx"| vegeta attack -rate=300 -duration=300s -timeout=300s | tee results.bin | vegeta report
如果提示证书不受信任，则将其域名根证书（.cer）放到放到 /etc/pki/ca-trust/source/anchors目录下
然后运行 /bin/update-ca-trust
通过以下命令得出ssl加密耗时：
curl -w "TCP handshake: %{time_connect}, SSL handshake: %{time_appconnect}\n" -so /dev/null https://mail.test.com