2.2 版本下的权限控制语句在 2.4 下已经不再适用，需要做一些调整。

Order deny,allow
Deny from all

应该改成：Require all denied

Order deny,allow
Deny from all
Allow from example.com

应该改成：Require host example.com

Order allow,deny
Allow from all

应该改成：Require all granted

嗯，挺好，新语法更加简单。