什么是缓存控制：私有？ [英] What is Cache-Control: private?

问题描述

当我访问 chesseng.herokuapp.com 时，我得到一个看起来像

When I visit chesseng.herokuapp.com I get a response header that looks like

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

然后我刷新页面并获得

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。如果这适用于缓存，那么 Expires 和 Cache-Control：max-age 的重点是什么。当我在 https://developers.google.com/speed/上测试页面时，会增加混乱。 pagespeed / insights / 告诉我利用浏览器缓存。

so it seems like caching is working. If that works for caching then what is the point of Expires and Cache-Control:max-age. To add to confusion, when I test the page at https://developers.google.com/speed/pagespeed/insights/ it tells me to "Leverage browser caching".

推荐答案

Cache-Control: private

表示全部或部分响应消息仅供单个用户使用，不得由共享缓存（例如代理服务器）缓存。

Indicates that all or part of the response message is intended for a single user and MUST NOT be cached by a shared cache, such as a proxy server.

来自 RFC2616第14.9.1节

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