On Sun, 11 Feb 2001, Rasmus Lerdorf wrote:
> Sascha, I'm having a bit of trouble grasping why the Expires directive is
> set to a date in the past when cache-control is set to private. ie.
As there is no way to differentiate between user agents and
proxies in HTTP/1.0 with regard to expiration options, we
tell all clients to never cache a page.
HTTP/1.1 conforming clients will ignore the Expires header,
as it is overwritten by Cache-Control: max-age (see RFC 2616,
section 13.2.4 Expiration Calculations).
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