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When the checker gets a redirect, it reports an error when the encoding of the 30x response is not utf-8; the spec says not to do so: "If the HTTP status indicates redirection (status code 3xx): Do not carry out tests on the response" http://www.w3.org/TR/mobileOK-basic10-tests/#http_response
I've started to patch CharacterEncodingSupportTest.xsl to fix that bug, but I haven't tested it yet.
oops, wrong assignee
Tested in CachingTest/12, and seems to be worky.