Hot answers tagged squid
Use your firewall to reject (not drop) UDP packets from squid. It'll soon get the message. I do wonder why on earth you'd want to do this, though.
apt uses its own fetcher (/usr/lib/apt/methods/http), not wget, so your literal question is unanswerable. Going a little broader, according to a strings over that file, Proxy-Authentication: Basic is supported, but there's no mention of Digest, so I'm going to guess that you're out of luck.
The number of file descriptors is set in the systemd unit file. By default this is 16384, as you can see in /usr/lib/systemd/system/squid.service. To override this, create a locally overriding /etc/systemd/system/squid.service which changes the amount of file descriptors. It should look something like this: .include /usr/lib/systemd/system/squid.service ...
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