Author: steve-mediawiki

Description:
MediaWiki is generating an invalid Expires header. By rfc2616 the Expires
header value should be a date, not a number. Also, by rfc2616, the presence of
a "max-age" directive in the Cache-Control header overrides any Expires header,
regardless of which is more restrictive; so the invalid Expires header doesn't
have any effect on an HTTP 1.1-compliant cache or user agent. (Maybe it's there
trying to cover for caches that don't grok HTTP 1.1 right, but it's still
invalid to put a number there instead of a date.)

The fix is easy: remove the two 'header("Expires: -1")' lines in OutputPage.php.
I haven't tested with all UAs and caches, so if you know this was working
around a problem with a particular UA I'd suggest taking rfc2616's suggestion
about "pre-expiring" a page by naming a date known to be in the past -- that is,
change "Expires: -1" to "Expires: Wed, 31 Dec 2003 00:00:00 GMT".

Loving working with MediaWiki -- thank you!

Version: 1.3.x
Severity: minor
URL: http://mbrt.renlabs.com/wiki/