tomcat non-root start port 80 or 443

Tomcat is started by root by default. If it is started by ordinary users, it must be a port above 1024. It cannot use 80 or 443,

so it can only be
forwarded by iptables port.

iptables -t nat -A PREROUTING -p tcp --dport 443 -j REDIRECT --to-port 8443


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