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-Rangesbytes
Cache-Controlmax-age=172800
ConnectionKeep-Alive
Content-Length561276
Content-Typeimage/jpeg
DateFri, 18 Nov 2011 02:18:18 GMT
ETag"2000000010a90-8907c-46ea3c3de04ac"
ExpiresSun, 20 Nov 2011 02:18:18 GMT
Keep-Alivetimeout=5, max=99
Last-ModifiedTue, 14 Jul 2009 05:32:31 GMT
ServerApache/2.2.14 (Win32)
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