How do I setup proxy automation?

[ChurreylMC]

Set Proxy server automatically for clients

I searched for that but I can't find any complete solution to doing that. Are this one is OK? https://findproxyforurl.com/deploying-wpad/

How do I setup proxy automation?
I know this is technically a duplicate of the linked thread.
But the wpad deployment is necessary for the stated solution,
and unfortunately the link given for that is no longer valid.
Or should I just look it up myself?
Because I looked at the site from the broken wpad deployment link,
and they don't have instructions on how to deploy a wpad setup anymore.

[Tomer]

Wpad will only work if the client is configured to look for proxy configuration, if you are trying to force clients to pass through your proxy then you can either use firewall rules to redirect the traffic to your proxy. or hack the dns to return your proxy address instead of any other website.

Note that the proxy you are running will need to support receiving relative http requests, and you might even need to add the proxy ca to the clients truststore if you want to be able to proxy https request as well.

[ChurreylMC]

I'm the only one that uses my router, so that's fine.
It's also a local-only proxy, so it doesn't handle any data besides my own.
And the proxy in question is http anyway.
I don't know why, but I don't get the issues I've been told happen with http proxies these days.
Could that be because it's a local-only proxy with no out-side access to the proxy in and of itself?
I don't care what format and all the proxy automation script serving takes,
as long as it can be ran/served from OpenWRT.

[Tomer]

Well, you can try setting a dnat rule that takes all port 80 traffic and redirects it to your proxy server and see if that works for you.

@ChurreylMC

I don't know why, but I don't get the issues I've been told happen with http proxies these days.
Could that be because it's a local-only proxy with no out-side access to the proxy in and of itself?

I am not sure which issues you are talking about so I can't really comment.

[lleachii]

Related:

How do I get OpenWrt to use a proxy?

How do I get OpenWRT to use a proxy? I don't mean opkg using a proxy, I already have that setup. I also don't mean a transparent proxy for connected devices. I mean the core os and ssh terminal being able to use the proxy required to be able to access files and services from the internet.

[reinerotto]

@Tomer

you might even need to add the proxy ca to the clients truststore if you want to be able to proxy https request as well.

Not exactly. Only required, in case of "deciphering" the request.

[Tomer]

I know.. that is why I said might...

[ChurreylMC]

@Tomer

Well, you can try setting a dnat rule that takes all port 80 traffic and redirects it to your proxy server and see if that works for you.

that would only affect web traffic.
http proxies (at least the one from my hotspot app) can handle everything, not just web traffic.
And I'm not asking how to make a proxy.
I'm asking how to host/run a proxy automation script for the relevant option on devices when setting a proxy in them.
But not how to route or do anything else, just the auto-config script.
This highlighted option is Windows 10's form for using the option I mean.