Options +MultiViews
ForceLanguagePriority Prefer
LanguagePriority ja en
SetEnvIf Cookie (^|\s)lang=\"?(ja|en)\"? prefer-language=$2
SetEnvIf Request_URI \.(ja|en)$ prefer-language=$1
Header append Set-Cookie "lang=%{prefer-language}e;expires=Mon, 01-Jan-2018 00:00:00 GMT;path=/" env=prefer-language
Header append Cache-Control no-cache
