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A few hours ago Tim changed how the wiki handles output buffering and compression so that a Content-Length HTTP header can be sent.
The primary benefit of this is that the Squid proxies in Amsterdam and Seoul will be better able to maintain persistent connections to Tampa, which should improve performance for logged-in visitors in Europe and Asia.
There were a couple small bugs which unfortunately we didn't catch before putting it live:
* Breakage causing Special:Export to cut off unexpectedly with bogus 'Content-Length:' header, thus breaking transwiki import:
This is now fixed.
* Incorrect 'Vary: Accept-Encoding' header for anonymous page views, causing logged-in visitors to sometimes see logged-out pages (with default skin and login link instead of link to own user/talk/contribs):
The bug is fixed, but a fair number of cached entries are still present. They'll vanish over time, but I'm not sure if we currently have a clean way to flush them in bulk.
- -- brion vibber (brion @ pobox.com / brion @ wikimedia.org)