Expires field when cache-control = private?

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. HTTP/1.1 200 OK Date: Sun, 11 Feb 2001 10:06:08 GMT Server: Apache/1.3.13-dev (Unix) PHP/4.0.5-dev X-Powered-By: PHP/4.0.5-dev Set-Cookie: PHPSESSID=c4ea423ca12d1ece0791c7a71b9ac96e; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: private, max-age=10800, pre-check=10800 Last-Modified: Sat, 10 Feb 2001 15:12:35 GMT Connection: close Content-Type: text/html Wouldn't this mean that it would never get cached, even in a user's private cache? By the way, is your birthday Nov.19.1981? ;) Is this an oversight, or are you trying to work around some common bug in proxy-cache systems out there? Otherwise I suggest this patch: Index: session.c =================================================================== RCS file: /repository/php4/ext/session/session.c,v retrieving revision 1.192 diff -u -r1.192 session.c --- session.c 2001/01/07 10:42:15 1.192 +++ session.c 2001/02/11 10:08:22 @@ -683,8 +683,13 @@ CACHE_LIMITER_FUNC(private) { char buf[MAX_STR + 1]; + time_t now; - ADD_COOKIE("Expires: Thu, 19 Nov 1981 08:52:00 GMT"); + time(&now); + now += PS(cache_expire) * 60; + strcpy(buf, "Expires: "); + strcat_gmt(buf, &now); + ADD_COOKIE(buf); sprintf(buf, "Cache-Control: private, max-age=%ld, pre-check=%ld", PS(cache_expire) * 60, PS(cache_expire) * 60); ADD_COOKIE(buf);