Cache-Control s-maxage标头是否覆盖浏览器缓存的Expires标头? [英] Does Cache-Control s-maxage header override Expires header for browser cache?
问题描述
我想设置一个远期的Expires标头来减少从各个浏览器发出的请求。
I want to set a far future Expires headers to reduce requests made from individual browsers.
我还想设置Cache-Control:s-maxage = 600,以便代理缓存(和CDN)每10分钟对原始内容重新验证新内容。
I'd also like to set Cache-Control: s-maxage=600 so that proxy caches (and CDNs) revalidate with the origin every 10 minutes for fresh content.
尽管存在Cache-Control标头,浏览器是否会尊重Expires标头(据说取代它)用s-maxage指令?
Will browsers honour the Expires header despite the existence of a Cache-Control header (which supposedly supersedes it) with a s-maxage directive?
推荐答案
如果响应同时包含Expires和Cache-Control max-age指令,则max-age会覆盖Expires标头,即使Expires标头更具限制性。此规则允许源服务器为给定响应提供比HTTP / 1.0缓存更长的到期时间。
If a response includes both an Expires and a Cache-Control max-age directive, the max-age 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 cache than to an HTTP/1.0 cache.
来源:< a href =http://condor.depaul.edu/dmumaugh/readings/handouts/SE435/HTTP/node24.html\"rel =nofollow> http://condor.depaul.edu/dmumaugh/readings/handouts/ SE435 / HTTP / node24.html
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