Try something like RewriteCond ${MyMap:%{HTTP_HOST}|not-found} !=not-found RewriteRule (.*) http://${MyMap:%{HTTP_HOST}}$1 And be sure to use the RewriteLog to help you debug.
Joshua,Just one more thing very quickly (I haven't tested, it's on a production server now),
Can I put wildcard records in the map file as well, or will that break things?
*.host.com *.internal.host.com ?I would believe that this will affect other lines in the map file, hence, I'd rather ask first before just doing it....
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