当我访问chesseng.herokuapp.com时,我得到一个看起来像的响应头
Cache-Control:private
Connection:keep-alive
Content-Encoding:gzip
Content-Type:text/css
Date:Tue, 16 Oct 2012 06:37:53 GMT
Last-Modified:Tue, 16 Oct 2012 03:13:38 GMT
Status:200 OK
transfer-encoding:chunked
Vary:Accept-Encoding
X-Rack-Cache:miss
然后我刷新页面然后得到
Cache-Control:private
Connection:keep-alive
Date:Tue, 16 Oct 2012 06:20:49 GMT
Status:304 Not Modified
X-Rack-Cache:miss
所以看起来缓存工作正常.如果它适用于缓存,则Expires和Cache-Control的重点是:max-age.更令人困惑的是,当我在https://developers.google.com/speed/pagespeed/insights/上测试该页面时,它告诉我"利用浏览器缓存".