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RewriteEngine On RewriteCond %{HTTP_USER_AGENT} ^BadBot.* RewriteRule .* - [F]
RewriteMap robotmap dbm:/path/to/file/map.db RewriteCond %{HTTP_USER_AGENT} !="" RewriteCond ${robotmap:%{HTTP_USER_AGENT}|NOT-FOUND} != NOT-FOUND RewriteRule .* - [F]