apache配置expires_module缓存静态文件
Apache版本apache_2.2.14-win32-x86-openssl-0.9.8k.msi
修改httpd.conf文件：
1，去掉#LoadModule expires_module modules/mod_expires.so这行前面的#号
2，增加如下配置
<IfModule expires_module> ExpiresActive On ExpiresDefault "access plus 2 days" ExpiresByType application/x-shockwave-flash "access plus 3 days" </IfModule>
restart apache服务器就生效了
通过httpwatch观察http请求Headers Received：
Expires已经是两天后了
(Status-Line) HTTP/1.1 200 OK Accept-Ranges bytes Cache-Control max-age=172800 Connection Keep-Alive Content-Length 561276 Content-Type image/jpeg Date Fri, 18 Nov 2011 02:18:18 GMT ETag "2000000010a90-8907c-46ea3c3de04ac" Expires Sun, 20 Nov 2011 02:18:18 GMT Keep-Alive timeout=5, max=99 Last-Modified Tue, 14 Jul 2009 05:32:31 GMT Server Apache/2.2.14 (Win32)
