Stephen Summerfield wrote:
> The only way to uniquely identify a host is by hostname or IP address, so
> you could do something with these.
>
> This may fall down if there is a web proxy/firewall between the server and
> the browser as the requests will appear to come the host (IP of proxy).
> However I seem to recall that some proxies add an HTTP header indicating the
> original host name/IP address (I could be wrong on that).
>
On the public Internet, you can assume it will fall down. On many corporate
networks, the IP addresses used within the local network are not even
Internet-addressable (because they use the IP address ranges reserved for LANs),
and all of the PCs on the inside appear to have the same IP address when accessing
an external site.
HTTP as a protocol has many virtues, but making it real easy to track individual
users is not one of them.
>
> HTH,
>
> Steve S
>
Craig McClanahan
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