https://bugzilla.wikimedia.org/show_bug.cgi?id=27935

Roan Kattouw <[email protected]> changed:

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--- Comment #16 from Roan Kattouw <[email protected]> 2011-03-09 12:03:54 
UTC ---
So here's what's going on:

Pages with parentheses and certain other special characters in their titles
have more than one correct URL: one with literal parentheses, one with
parentheses URL-encoded, and I'm sure mixes of those two are accepted as well.
However, when a page changes, Squid only purges the urlencoded URL and doesn't
purge the others. This means that anonymous users will see outdated versions of
these pages when they visit it through one of the other, unpurged URLs. Besides
possibly outdated content, these stale versions also contain pre-ResourceLoader
direct CSS links to 1.16 URLs, and of course those 404. For logged-in users,
Squid caching is bypassed, so they won't observe this behavior.

I'll talk to Mark about this issue.

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