___ %{REQUEST_URI}はQUERY_STRINGは含まない。
PHPの環境変数と違って、QUERY_STRINGは含まない。
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Apache Module mod_rewrite http://httpd.apache.org/docs/current/mod/mod_rewrite.html#rewritecond
REQUEST_URI) The path component of the requested URI, such as "/index.html". This notably excludes the query string which is available as as its own variable named QUERY_STRING.