Re: monitoring proxied web traffic

Konrad,

Does your proxy also communicate with a content-inspection device, like for 
anti-virus inspection of web content?  If so, there may be a way to correlate. 
The web proxy would use the Internet Content Adaptation Protocol (ICAP) to 
encapsulate the HTTP/HTTPS traffic to send to the anti-virus server for 
inspection.  I wrote a protocol analyzer for ICAP.  This protocol is very 
similar in syntax to HTTP, and it contains header fields (supported by most 
web proxy vendors) called "X-Client-IP" and "X-Server-IP" which correspond to 
the original IP addresses of the local web client and the remote web server, 
respectively.  Please see my presentation from BroCon 2016, perhaps it 
applies:

https://www.zeek.org/community/brocon2016.html

Mark

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