How can you use mod_rewrite to redirect traffic based on User-Agent?

Use `RewriteCond` to check the `HTTP_USER_AGENT` header and `RewriteRule` to specify the redirection target. For example, `RewriteCond "%{HTTP_USER_AGENT}" "Macintosh; Intel Mac OS X 10_9_3" [NC]` followed by `RewriteRule 1.html 2.html` will redirect requests from that Safari browser to `2.html`. This technique is demonstrated in the article for filtering traffic by client type.