What is a simple proxy server for whitelisting sites?

Question

Network administration

The goal is to block absolutely all Internet connections, except for a certain list of websites. So far, the most logical solution from my point of view is blocking the Internet on the router (for all machines, except for the proxy) + using a proxy server raised on the server in LAN. What proxy server can be used for this? the first and most important requirement is bulletproofness, the proxy should not be allowed to go to any left site. It is desirable that there be a fairly simple management and logging of site visits, but this is optional.

Answer 1

The first thought is Squid at the exit, after lighting up a small manual, nothing is easier.