MultiViews does not properly negotiate documents for Mozilla, if apache is started with cs_CZ locale. Expected reason of this bug is fact that decimal point for Czech is ",", an so "q=0.66" cannot be properly parsed by scanf. HTTP_ACCEPT_CHARSET="ISO-8859-2, utf-8;q=0.66, *;q=0.66"
One does not have the luxury of choosing local decimal semantics for RFC 2616, they are very clearly defined as an ascii '.'. You could use a utility such as netcat (nc) to listen to a port, e.g. 8080, and then use the suspect browser to request a page. NC will report the headers transmitted by the browser, proving or disproving your suspicions.
The problem is not browser, but Apache. New Mozilla generates: HTTP_ACCEPT_LANGUAGE="cs, sk;q=0.80, en;q=0.60, ru;q=0.40, de;q=0.20" This is not parsable with Apache started with Czech locale, because it expects "," in numbers. If I do: apachectl stop LC_ALL=C apachectl start everything works OK, but with LC_ALL=cs_CZ apachectl start apache does not work properly for example on initial page of freshly installed apache (Czech locale is not only locale with decadic comma problem). The fix is simple set setlocale(LC_NUMERIC, "C") or something similar to proper place of Apache (I did not found proper place) or not to set locale at all. Off Topic: There is a small fix to Czech locale (with no relation with this bug, but can be easilly fixed by anybody with write access to Apache repository): Czech locale is oficially called cs_CZ (language Czech = cs, country Czech Republic = CZ) since 1994, but Apache still uses cz as language code. It should be fixed at following places: conf/httpd.conf-dist: s/cz/cs/g mv htdocs/index.html.cz htdocs/index.html.cs
Well, the language code is fixed in 2.1 and proposed for backport. A mod_negotiation patch was also applied some time ago to 2.1, but there's still an outstanding discussion about some details. Although your report is much older, I'll mark this one as duplicate. Thanks for your report and thanks for using Apache. *** This bug has been marked as a duplicate of 17564 ***