Expires 在哪些情况下是必须的呢？
This topic created in 5130 days ago, the information mentioned may be changed or developed.
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fsw90628 Apr 25, 2012  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. |
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luser Apr 25, 2012
Expires支持更广泛 印象中cache-control是http1.1新加的 详见rfc2616
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