adblock2privoxy VS proxy

All you're asking is already possible with Privoxy[1], which is even stronger than a browser adblocker. It's a very old software: it used to be unmaintained and lacking some essential features, but thankfully the development resumed and is now fully fuctional again with the modern web.

It can be used as an adblocker based on domain, request path, HTTP headers, etc, but it can do much more. It can redirect requests (for example, replacing assets from a CDN with a local cache), modify headers (stripping or making cookies temporary, changing user agent, etc.) and even rewrite the content of web pages using regular expressions or any external program.

By default, it has only a basic configuration that blocks tracking and ads, but there are tools[2] that convert adblock rules to the Privoxy format, so it will be functionally equivalent to adblock.

It acts as a CONNECT proxy, so you can run it locally or on a router and if combined with a NAT rule, it can also work transparently (obviously, you need to manually trust a CA certificate for https).

[1]: https://www.privoxy.org/

[2]: https://github.com/essandess/adblock2privoxy

Thanks. So could one follow this guide (https://github.com/WhatsApp/proxy) and run the resulting proxy on a Linux VPS?