How to block certain sites and scripts in linux?

Question

linux

It is necessary to block some scripts from sites at the OS level. For example:

subdomain.site.rf/spyware.js

but to

subdomain.site.rf/

have worked.
At first I wanted to block through the firewall, but then I read it and realized that this was a bit of a wrong tool.
The hosts file doesn't work either.

Answer 1

This can be done using a proxy server. Read about squid

Answer 2

Add rules in the banner cutter.