我已将以下代码添加到我的 .htaccess 中，但 PageSpeed Insights 仍显示 Leverage Browser Caching 建议。
<IfModule mod_expires.c>
ExpiresActive on
ExpiresDefault "access 1 month"
ExpiresByType image/x-ico "access 1 year"
ExpiresByType image/jpg "access 14 days"
ExpiresByType image/jpeg "access 14 days"
ExpiresByType image/gif "access 14 days"
ExpiresByType text/html "access 2 day"
ExpiresByType text/css "access 2 days"
ExpiresByType image/png "access 1month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/javascript "access 1 month"
ExpiresByType application/x-javascript "access 1 month"
</IfModule>
尽管如此，PageSpeed Insights 仍然指出我应该将浏览器缓存用于以下方面：
http://assets.pinterest.com/images/PinExt.png (60 seconds)
https://assets.pinterest.com/js/pinit.js (60 seconds)
http://0.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=60 (5 minutes)
http://1.gravatar.com/avatar/572ef8c1916a898c441306a0f75f883e?s=60&d=http%3A%2F%2F1.gravatar.com%2Favatar%2Fad516503a11cd5ca435acc9bb6523536%3Fs%3D60&r=G (5 minutes)
http://1.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=60 (5 minutes)
http://cdn.api.twitter.com/1/urls/count.json?url=http%3A%2F%2Fwww.mbaadmissiongurus.com%2Fsample-mba-sop&callback=twttr.receiveCount (13.6 minutes)
http://widgets.pinterest.com/v1/urls/count.json?url=http%3A%2F%2Fwww.mbaadmissiongurus.com%2Fsample-mba-sop&ref=http%3A%2F%2Fwww.mbaadmissiongurus.com%2Fsample-mba-sop&source=6&callback=PIN_1378214653068.f.callback[0] (14.8 minutes)
https://connect.facebook.net/en_US/all.js (20 minutes)
https://apis.google.com/js/plusone.js (30 minutes)
https://platform.twitter.com/widgets.js (30 minutes)
http://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js (60 minutes)
http://pagead2.googlesyndication.com/pagead/osd.js (60 minutes)
https://oauth.googleusercontent.com/gadgets/js/core:rpc:shindig.random:shindig.sha1.js?c=2 (60 minutes)
https://platform.stumbleupon.com/1/widgets.js (2 hours)
https://platform.linkedin.com/in.js (3 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=ExportControls.com/e-seminars (8 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=healthcare-tataaig.com/Health-Cover (8 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=worldeducationfair.com (8 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=www.Dulux.in (8 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=www.asianpaintshomesolutions.com (8 hours)
https://s2.googleusercontent.com/s2/favicons?domain_url=www.principalretirementindia.com (8 hours)