https://bugzilla.wikimedia.org/show_bug.cgi?id=67559

--- Comment #7 from Bawolff (Brian Wolff) <[email protected]> ---
Squid and varnish use the same purging mechanism. All the class names still say
squid for historical reasons.

On commons: mediawiki sends a HTCP purge packet on udp to a multicast address
(see SquidUpdate).this multicast address goes to all varnish boxes, with a
relay server to transfer it across data centers. The vhtcpd deamon on the
varnish boxes turn that packet into a normal http PURGE against the varnish on
localhost.

This setup is a bit finicky and has caused many issues over the years.

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