今天在校内尝试从git.bistu.edu.cn克隆代码，使用https协议时候发现clone失败，于是开始实验，使用curl连接cas.bistu.edu.cn、x.bistu.edu.cn、chat.bistu.edu.cn、community.bistu.edu.cn、site.bistu.edu.cn
发现只有cas和site正常，其他的都报错了，但是浏览器访问并未发现错误。
联想之前ZFZ的safari访问git报错
http://tomcat.apache.org/tomcat-7.0-doc/ssl-howto.html
1.生成tomcat自签名证书
keytool -genkey -alias tomcat -keyalg RSA -keystore self.jks
Enter keystore password: 设置keystore密码
Re-enter new password: 设置keystore密码
What is your first and last name?
[Unknown]: localhost 输入localhost
What is the name of your organizational unit?
[Unknown]:
What is the name of your organization?
[Unknown]:
What is the name of your City or Locality?
[Unknown]:
What is the name of your State or Province?
[Unknown]:
What is the two-letter