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---- Apache: execute "global" php script when robots.txt requested
phranque - 12:20 pm on Aug 20, 2012 (gmt 0)Thread source:: http://www.webmasterworld.com/robots_txt/4486406.htm
mod-rewrite directives are legal in server config context so there's apparently no reason you can't have a server-wide RewriteRule configured there.
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