monitoring proxied web traffic

Hello,

I need to monitor web traffic with Zeek that is going through an implicit
web proxy. I would like to be able to see real client IPs in which case tap
would be placed before the proxy, however I will not be able to see the
real destination IP as it will always be proxy IP. I can also tap on the
other side of the proxy where source will always be proxy IP at the same
time.

Is there a way with Zeek to correlate the two sessions (before and after
proxy) somehow?

I realize that UID or Community ID are probably not going do it since
different source/destinations pairs for each for each session, but maybe
based on the timestamp/URI/SNI/byte or packet counts/etc?

I was also thinking "X-Forwarded-For" header but I guess that would only
work for HTTP and not HTTPS connections.

Thank You,

Konrad

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