如果 header 中已经设置了 Cache-Control 头，那么其实也可以不用设置 Expires？ - V2EX

如果 header 中已经设置了 Cache-Control 头，那么其实也可以不用设置 Expires？ - V2EX

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Expires 在哪些情况下是必须的呢？

2 条回复 1970-01-01 08:00:00 +08:00

1

fsw90628

2012-04-25 00:50:14 +08:00

3

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.

2

luser

2012-04-25 01:11:05 +08:00

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

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