Transparent Proxy

Proxy Server 4.0 supports transparent proxy for HTTP/1.1 connections. Transparent proxying involves intercepting and processing web requests by using the proxy server, without the knowledge or control of clients. For example, a router for a local network is configured to redirect incoming TCP connections to the local port, in which the proxy server is active.

Add the following directive to the proxy server default object in the obj.conf file:

NameTrans fn="host-map"

This configuration enables the proxy server to use the HTTP Host: header of incoming requests to identify and redirect the request to the target remote server.

Transparent proxy servers that decide connections based on the HTTP Host: headers are vulnerable to fake HTTP Host: headers forged through the active content. Therefore, suitable ACL configurations must be implemented to prevent connection to web sites that might host malicious content.