Varnish

Mark intends to test Varnish for feasibility of using it instead of Squid for Wikimedia CDN purposes.

Things that need special consideration

• HTCP purging
• Immediate purging of cache objects (nuke?)
• Header normalization (Host, Accept-Encoding...)
• Two-layer setup (CARP style)
• Compatible logging
• Request stats

Would be nice

• SSL
• IPv6

Many of these are probably already taken care of by our friends at Wikia, and therefore possibly also within Varnish itself...