How to force a proxy server to redirect requests to internal services to the internal network, and not to the external one?

Question

Squid

Given:
- Internal network;
- External network;
- Services within the network;
- Squid proxy.
Problem:
When trying to access a service inside the network, such as a web server, the proxy forwards the request to the outside network, then returns an error.
Question:
How can I make requests to addresses from a certain range be transmitted to the internal network, instead of the external one?

Answer 1

Add the appropriate route to the proxy server through the local interface. If the call is made not by IP, but by name, make sure that the DNS server for local clients returns local addresses (see split DNS).

Answer 2

Are the addresses (IP/DNS) of internal services added to proxy exceptions (on the client)?