If I am in one autoproxy PAC file and returning the "PROXY xxx.com:80" option, can that link be to another PAC file? Do the url and host parameters for FindProxyForURL(url, host) stay the same or is there something lost?
Continuing on the same topic, what if one or both of these proxy files are hosted behind HTTPS?
The doc says (reformatted):
This means: It is not a URL, but a hostname (or IP address) and port number.
You can't daisy-chain PAC files, but WPAD might come in handy depending on what you're trying to accomplish.