You can’t do this with pound.
Try haproxy (or probably several others) instead. Haproxy does this and
much more and is much lighter on resources compared to pound.
Or check out swiftiply, which in my tests could handle more or less the
same load as haproxy, but at full load each requests was handled in <
200ms, while with haproxy it became > 2sec. But I remember it still
having some issues when I tested it, not sure what the current status