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Originally Posted by mmm
One interesting effect of the new caches (software only?) is that they are more transparent than the inktomis
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There is more than one method for web-proxies to pass on the identity of the original browser to the server. NetApp NetCaches (and squid, another brand) use the
X-Forwarded-For header, which is widely understood. Inktomis use the
Client-IP header, which is less widely understood. Some (but not all) of the NTL Inktomis send both X-Forwarded-For and Client-IP, in an attempt to make themselves better understood.
At present, it is necessary for servers to understand both conventions for them to be able to cope with all NTL customers correctly. Many websites which purport to tell you your IP address fail to understand both these conventions, and so hand out the addresses of proxies instead of browsers.