Suggested redesign

[jcham]

Per our discussion yesterday, a suggested redesign of the middleware interface is for it to be something like (sorry if I don't know the proper format for specifying these things):

cancelf = app.call(request_env) { |response_hash, response_error|
   ...
}
# where `cancelf` is a method that can be called to cancel the request down the stack.

[jcham]

Also, suggested:

• Futures moved out of the stack into the direct client interface (possibly using existing futures libraries)
• Bottom HTTP middleware is simple and swappable between one using EM and one using Thread.
• Timeouts be its own self-contained middleware that just calls cancelf at the appropriate time. Race conditions can result in multiple up-stack responses, this is ok.

[godfat]

Thanks for the summary and photos!
Not sure when I shall try this approach,
but I think it should be worth trying.

Maybe in rest-core 3.0 or something.