How to prevent Slowloris with iptables on CentOS

following this command line as root access

iptables -I INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -I INPUT -m state --state INVALID -j DROP

iptables -I INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above 20 -j DROP
/etc/init.d/iptables save

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