http - Expires vs max-age，如果两者都在 HTTP 响应中声明，哪个优先？

Question

如果 HTTP 响应同时返回 Expires 和 max-age 指示使用哪一个？

Cache-Control: max-age=3600
Expires: Tue, 15 May 2008 07:19:00 GMT

考虑到每个指的是不同的时间点。

Answer 1

看到这个答案:

Difference between three .htaccess expire rules

If a response includes both an Expires header and a max-age directive, the max-age directive overrides the Expires header, even if the Expires header is more restrictive. This rule allows an origin server to provide, for a given response, a longer expiration time to an HTTP/1.1 (or later) cache than to an HTTP/1.0 cache. This might be useful if certain HTTP/1.0 caches improperly calculate ages or expiration times, perhaps due to desynchronized clocks.