How to route iptables inside linux?

Question

iptables

Hello, I have a raspberry pi connected to a router and it has an application to which I need to redirect all Internet traffic from ports 80 and 443 (redirect to port 30443). I do it with

iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 30443
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 30443

All setup of my iptables:

sh -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
iptables -A FORWARD -i eth0 -o eth1 -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 80 -j REDIRECT --to-ports 30443
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp --dport 443 -j REDIRECT --to-ports 30443

Why isn't traffic going through the app?