Coying here the problem reported in Support Desk (in URL):
I've just upgraded from 1.19 to 1.23 and since that the short URLs only works, if the title contains ASCII characters only. If there are czech national characters in the title, the page is not found, because the national characters are wrongly encoded. I can still open the pages using short URLs, when I enter the short URL directly into the navigation bar. So redirection in my IIS7 seems to work normally. If I disable the short URLs by $wgArticlePath, it works
'''1) short Url disabled'''
GET /w/index.php title=Hlavn%C3%AD_strana 80 * 304 0 0 281
'''2) short Url enabled'''
GET /w/index.php title=HlavnÄ‚_strana 80 * 404 0 0 140
From the logs it is clear, that if short URL is disabled the title is escaped, but if short URL is enabled, it is not escaped (and probably in wrong encoding).
I found something related in the HISTORY file:
$wgUsePathInfo = true; is no longer needed to make $wgArticlePath work
on servers using like nginx, lighttpd, and apache over fastcgi. MediaWiki
now always extracts path info from REQUEST_URI if it's available.
Which corresponds to this:
_SERVER["REQUEST_URI"] = "/HlavnĂ_strana"
_SERVER["QUERY_STRING"] = "title=Hlavn%C3%AD_strana"
It seems, that while the article name is correct in _SERVER["QUERY_STRING"] variable, the _SERVER["REQUEST_URI"] contains it invalid encoded.
The commit mentioned in HISTORY is 9d837976314a88918ad20d92c66da704043190e0 (gerrit change 3680)
I haven't tested it. It's listed as "Configuration changes in 1.20"
OS: Windows Server 2008