Last modified: 2012-12-21 18:48:07 UTC
There are some reports of users on en:WP:VP/T that they had no diff styling anymore. It was figured out that some users were getting: "Scripts should use an informative User-Agent string with contact information, or they may be IP-blocked without notice." on the below URL, even though they were using FF15 and Google Chrome. http://bits.wikimedia.org/en.wikipedia.org/load.php?debug=false&lang=en&modules=mediawiki.action.history.diff&only=styles&skin=vector&* I think that this might have been due to squid caching + client side caching of the URL? Probably failures like that should aggressively make sure that they are not client side cached (Cache-Control: no-cache, must-revalidate instead of public), and have a short squid caching (a minute should be more than plenty to withstand any trouble right ?).
Created attachment 11160 [details] HTTP response headers Through some testing with netcat, I can confirm Varnish is caching these errors, apparently despite the "Cache-control: no-cache" header.
Sometimes I get this on console: Failed to load resource https://bits.wikimedia.org/pt.wikipedia.org/load.php?debug=false&lang=pt-br&modules=mediawiki.action.history.diff&only=styles&skin=vector&*
