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IP Lookup with applet

 
Ranch Hand
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How would I look up client info. of the incoming traffic on the site, such as name and IP address, with applet?
Could you give me an snippet?
Thanks much.
 
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It's contained in an HTTP header. However, IP addresses are not suitable to uniquely identify a user - aside from the spoofing issue, anyone managed by DHCP and/or NAT won't have a unique and unvarying IP address.
 
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