如果是Apache环境下面，可以在.htaccess文件中添加下面的代码，用于设置图片的HTTP缓存和有效期（需要开启apache的headers模块支持），减少网站的图片资源请求压力，提高访问速度和你的pagespeed值^_^。
<ifmodule><br>
<filesmatch><br>
Header set Cache-Control "max-age=604800"<br>
</filesmatch></ifmodule>上面的代码设置了网站的图片使用为期一周的HTTP缓存，当然，你一样可以给js或者css文件加上http缓存哦。 AD：真正免费，域名+虚机+企业邮箱=0元
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