Expires in http header is currently set to:
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Wouldn't it be better to set it to some sane value or to omit it?
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Which project is this about?
Mediawiki. Core, I'd say. Certainly not wikipedia.
How to reproduce this problem?
Point this at some custom installation of mediawiki.
curl --head http://www.wiki.org/wiki/Main_Page
Then look at the Expires: header.
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I fail to find a wiki that does print an Expires: header with the given command.
Reminded me of ancient T2276 and http://stackoverflow.com/questions/24476653/mediawiki-send-wrong-header-expires
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The more professional ones most likely remove that header at some level.
Here is one example wiki that does send this header:
curl --head http://wiki.lividinstruments.com/wiki/Brain_V2_and_Brain_Jr._Configure
Sending this header or not might depend on mediawiki settings.
This is done in includes/OutputPage.php. There is twice this line:
$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );
When I out comment this line, Expires:, it's not longer set to Thu, 01 Jan 1970 00:00:00 GMT. It changes to Expires: Wed, 25 Mar 2015 14:56:10 GMT then.
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OutputPage only outputs those headers if caching is explicitly disabled, which works as intended by outputting Cache-Control: max-age=0 as well as the Expires headers with past date (in this case 1970, using 0 as Unix timestamp).