As you have found. There is no destination IP at REQMOD time. Even if squid were to do a lookup it does not know the outcome of the routing decision in order to select which IP to send REQMOD. Especially if REQMOD is the source of that decision.
A normal (forward) proxy has only a server host name (aka URI domain) to work with until the server connection is about to be opened. The REQMOD can be passed that name, but needs to account for *any* of the IPs it finds for that (or none) might be used.
Interception proxy try to connect to the same server IP as the client was using. But may not need a server connection at all if cache storage or collapsed forwarding catches the transaction.
Amos
Amos
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