Proxy as a layer between the client and another proxy?

Question

proxy

Greetings. The task is to raise a proxy server, which will be a layer between the client and another proxy server, authorization on which occurs through a login and password.
Perhaps there are ready-made proxy servers with advanced settings (with a filter by host, etc.), or supported plugins in which you can describe all the logic.

Answer 1

SQUID
Supports proxy chaining, acl for all occasions, helpers for authorization and a bunch of other things.