[root@www logs]# vim /usr/local/apache2/conf/extra/httpd-vhosts.conf

在<VirtualHost *:80>和</VirtualHost>之间配置添加下面内容

<IfModule mod_expires.c>

    ExpiresActive on

    ExpiresByType p_w_picpath/gif  "access plus 1 days"

    ExpiresByType p_w_picpath/jpeg "access plus 24 hours"

    ExpiresByType p_w_picpath/png "access plus 24 hours"

    ExpiresByType text/css "now plus 2 hour"

    ExpiresByType application/x-javascript "now plus 2 hours"

    ExpiresByType application/javascript "now plus 2 hours"

    ExpiresByType application/x-shockwave-flash "now plus 2 hours"

    ExpiresDefault "now plus 0 min"

</IfModule>

[root@www logs]# apachectl -t（检测配置文件）

[root@www logs]# apachectl graceful（重新加载配置文件）

测试：[root@www logs]# curl -x127.0.0.1:80 'http://www.test.com/static/p_w_picpath/common/logo.png' -I

我们会看到：Cache-Control: max-age=86400

那么现在进虚拟主机配置文件 ExpiresByType p_w_picpath/png "access plus 24 hours"把24改为12

再次测试[root@www logs]# curl -x127.0.0.1:80 'http://www.test.com/static/p_w_picpath/common/logo.png' -I

会发现Cache-Control: max-age=43200