/etc/apt/apt.conf.d/30autoproxy is in squid-deb-proxy-client 0.8.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | Acquire::http::ProxyAutoDetect "/usr/share/squid-deb-proxy-client/apt-avahi-discover";
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