mod_expires 模块的主要作用是自动生成页面头部信息中的 Expires 标签和 Cache-Control 标签，从而降低客户端的访问频率和次数，达到减少不必要流量和增加访问速度的目的。
启用expires_module模块
LoadModule expires_module modules/mod_expires.so
启用有效期控制
ExpiresActive On
全局配置，放在主conf或者虚拟域名的conf中
<IfModule mod_expires.c> ExpiresActive On ExpiresDefault "access plus 12 months" #禁止ajax的缓存 ExpiresByType application/json "access plus 0 seconds" #ExpiresByType text/html "access plus 12 months" #ExpiresByType text/css "access plus 12 months" #ExpiresByType text/javascript "access plus 12 months" #ExpiresByType image/gif "access plus 12 months" #ExpiresByType image/jpeg "access plus 12 months" #ExpiresByType image/jpg "access plus 12 months" #ExpiresByType image/png "access plus 12 months" #ExpiresByType application/x-shockwave-flash "access plus 12 months" #ExpiresByType application/x-javascript "access plus 12 months" #ExpiresByType application/javascript "access plus 12 months" #ExpiresByType video/x-flv "access plus 12 months" </IfModule>
mod_expires 实例:
<Directory /opt> ExpiresActive On ExpiresDefault "accesss plus 3600 seconds" 如果是1秒,后面也是seconds ExpiresByType application/octet-stream "accesss plus 1 months" 这是对特殊文件类型bin缓存1个月 <FilesMatch ^data.swf$> 针对opt目录下data.swf设置Expire值 ExpiresActive On ExpiresDefault "accesss plus 60 seconds" </FilesMatch> </Directory>
mod_headers实例
<Directory /opt> header set cache-control "max-age=3600" <FilesMatch ^data.swf$> header set cache-control "max-age=60" </FilesMatch> </Directory>
ExpiresByType比ExpiresDefault优先级高.当expires和max-age同时存在时,max-age的优先级会高于expires.
设置缓存也可以通过mod_headers模块修改cache-control来实现.
header set cache-control "max-age="3600".
