@rob_jordan: Is the source of this image available anywhere? There are a couple discrepancies that should be fixes (as mentioned in the comments), but its the best diagram I have seen.
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Use iptables to redirect the port
iptables -t nat -A PREROUTING ! -i lo -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 8000
You probably want to save your iptables rules afterwards (which is OS dependent)
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