[HELP] why the string match does not work in nat tables?

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hi there

i have been trying to apply the string match or external wurlmatch to
my NAT environment.
but the matches was not valid in NAT or tproxy
so i tried to verify TCP payload with debugging code in the string
match during runtime, and then i found there is no TCP data in skbuff

the string match works well in filter table, but it does not work in NAT.
i want to know why the string match does not work in NAT.
if you know that reason, please let me know


i used following iptables rules
#  iptables -A PREROUTING -t nat -p tcp --dport 80 -m string --string
"goole.com" --algo bm -j DNAT --to-destination 10.10.10.125:80

10.10.10.125 is IP address of my linux router and there is HTTP proxy server
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