How can I run a server on Linux on port 80 as a normal user?

# iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080

*nat
:OUTPUT ACCEPT [0:0]
:PREROUTING ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A PREROUTING -p tcp -m tcp -d 77.221.139.149 --dport 80 -j REDIRECT --to-ports 8000-8000 --to-port 8000
COMMIT