Rails core - Jul 2014 - Detecting ActionController::Live/streaming from a middleware?

I'm curious if there's a good way to detect from a Rack middleware
whether
a response is streaming or not.

From what I can see, my options are:

* In the Controller note we've included `ActionController::Live` somewhere 
the middleware can access it
* Look at the response object coming back to Rack to see if its class is 
`ActionController::Live::Response`
* Look at the `stream` (if available) on the response object returned to 
Rack to check if it's a `ActionController::Live::Buffer`

All of these ideas seem pretty brittle and liable to break across new 
versions of Rails and/or new streaming mechanisms that might come along. Is 
there something I'm missing?

Thanks!

Jason Clark
@jasonrclark
New Relic, Ruby Agent engineer

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