browser-cache - 最大年龄是相对于上次修改日期还是请求时间？

Question

当服务器提供 Cache-Control: max-age=4320000 时，

新鲜度是指请求时间后4320000秒，还是最后修改日期后？

Answer 1

RFC 2616 section 14.9.3 :

When the max-age cache-control directive is present in a cached response, the response is stale if its current age is greater than the age value given (in seconds) at the time of a new request for that resource. The max-age directive on a response implies that the response is cacheable (i.e., "public") unless some other, more restrictive cache directive is also present.

它总是基于请求的时间，而不是最后修改的日期。您可以通过在主要浏览器上进行测试来确认此行为。