启用apache expires_module 模块
1、启用expires_module 模块
# expire GIF images after a month in the client's cacheExpiresByType image/gif A2592000ExpiresByType image/png A2592000ExpiresByType image/jpeg A2592000# HTML documents are good for a week from the# time they were changedExpiresByType text/html M604800ExpiresByType text/css M604800
更多请看官方：http://httpd.apache.org/docs/2.0/en/mod/mod_expires.html
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