apache升级到2.4后，站点配置文件需要变化，否则会出现403 Forbidden错误：

Forbidden

You don't have permission to access / on this server.

下述是 Apache 2.2 VS Apache 2.4 的配置文件差异：

Deny All
        2.2 configuration:
            Order deny,allow
            Deny from all
        2.4 configuration:
            Require all denied
    Allow All
        2.2 configuration:
            Order allow,deny
            Allow from all
        2.4 configuration:
            Require all granted
    Allow Host
        2.2 configuration:
            Order Deny,Allow
            Deny from all
            Allow from example.org
        2.4 configuration:
            Require host example.org
    Directory 用 Require all granted

        <Directory /var/>
        Options FollowSymLinks
        AllowOverride None
        Require all granted
        </Directory>

    FilesMatch 維持用 Order

        <FilesMatch ".+\.phps$">
        SetHandler application/x-httpd-php-source
        Order Deny,Allow
        Allow from all
        </FilesMatch>