Redirecting specific traffic to amazon AWS

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http://serverfault.com – My server has recieved sudden increase in the (read) web traffic, requesting many map image tiles, and apache cannot handle it. Apache cannot even handle the redirections! The average load I get in my CentOS machine is more then 200.. Is there some software out there that can redirect SOME of the traffic, such as only the traffic from specific directory (such as http://example.com/maptiles/abc.png) to a different address (sucha as http://s3.amazonaws.com/mytiles/abc.png) ? can this be done by HAProxy? (HowTos)