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我在 WordPress 网站上的 .htaccess 中设置了一条规则。它看起来像这样：

# manual caching - force use of browser cache 
FileETag MTime Size 
<ifmodule mod_expires.c>   
   <filesmatch "\.(jpg|gif|png|css|js|ico|pdf|swf)$">
      ExpiresActive on
      ExpiresDefault "access plus 1 year"
   </filesmatch>
</ifmodule>

从我读过的东西来看，这应该处理所有到期标题。但是当我运行 gtmetrix 或 yslow 测试时，它们仍然给我这样的错误：

http://fonts.googleapis.com/css?family=Anonymous+Pro%3Aregular%2Citalic%2Cbold%2Cbolditalic%7C&ver=3.5.1
http://www.thisismydomain.org/wp-content/plugins/wp-ui/css/css.php?styles=wpui-light%7Cwpui-blue%7Cwpui-red%7Cwpui-green%7Cwpui-dark%7Cwpui-quark%7Cwpui-alma%7Cwpui-macish%7Cwpui-redmond%7Cwpui-sevin&ver=3.5.1
http://assets.pinterest.com/images/PinExt.png
http://0.gravatar.com/avatar/41ff57b7b930a31656ab460e5a56d425?s=100&d=wavatar&r=G
http://fonts.googleapis.com/css?family=Open+Sans:300,300italic,400,400italic,600,600italic,700,700italic&subset=latin,latin-ext
http://0.gravatar.com/css/hovercard.css?ver=201311ac
http://0.gravatar.com/css/services.css?ver=201311ac
http://0.gravatar.com/js/gprofiles.js?ver=201311ac
http://1.gravatar.com/avatar/ad516503a11cd5ca435acc9bb6523536?s=25&d=wavatar&forcedefault=y&r=G

其他页面显示到期标题的类似错误：

http://easyrotator.s3.amazonaws.com/.../FFF_arrow10_export.png (expiration not specified)
http://s7.addthis.com/js/300/addthis_widget.js (expiration not specified)
http://search.twitter.com/search.json?... (15 seconds)
http://connect.facebook.net/en_US/all.js (5 minutes)
https://apis.google.com/js/plusone.js (30 minutes)
http://c520866.r66.cf2.rackcdn.com/1/js/easy_rotator.min.js (33.2 minutes)
http://intensedebate.com/js/wordpressTemplateLinkWrapper2.php?... (60 minutes)
http://i.po.st/share/script/post-widget.js (3 hours)
http://www.thisismydomain.org/wp-content/plugins/wp-ui/css/css.php?styles=wpui-light%7Cwpui-blue%7Cwpui-red%7Cwpui-green%7Cwpui-dark%7Cwpui-quark%7Cwpui-alma%7Cwpui-macish%7Cwpui-redmond%7Cwpui-sevin&ver=3.5.1 (20 hours)

我认为这是因为那些特定的 css 和 js 不在我的域中？在这种情况下，我能做些什么来解决这个问题并提高我的速度分数吗？或者我还应该做些什么来获得更好的结果？而 thisismydomain 的那个...文件扩展名是 css.php，所以我不确定如何在 htaccess 中设置一个过期时间。感谢任何人都可以提供的任何指导！

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