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I'd say the pitch against Unicorn and Passenger is that it's language agnostic. There are other languages than Ruby, you know!

Depends on who I'm talking to.

Operations guy: Mongrel2 is a ops wet dream. Totally automatable and you can use it to easily carve your infrastructure up as needed to scale and deal with all the random crap programmers throw at you.

Programmers: Mongrel2 is future proof and gives you want you need with low friction. Wanna do sockets? Got it. Use any language? Got it. Change up the request flow to work around a bug? Got it. Drop Scala for Rails? Got it.

Or something like that.

> (particularly multiple protocols over the same socket)

> "killer apps" are for mongrel2

You just said it. Bypassing any connection limitations on the browser.