如果 header 中已经设置了 Cache-Control 头，那么其实也可以不用设置 Expires？

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Expires 在哪些情况下是必须的呢？

2 replies • 1970-01-01 08:00:00 +08:00

fsw90628

Apr 25, 2012

推荐：
https://developers.google.com/speed/docs/best-practices/caching

引用：
It is redundant to specify both Expires and Cache-Control: max-age, or to specify both Last-Modified and ETag.

luser

Apr 25, 2012

Expires支持更广泛印象中cache-control是http1.1新加的详见rfc2616