Are there any "clean" alternatives to Unicorn for HTTP streaming?

Are there any "clean" alternatives to Unicorn for HTTP streaming?

By "clean" I mean using the :stream option during render.

class MyController < ActionController::Base   def index     render :stream => true   end end

Unicorn is "clean".

What I should have wrote is "In addition to Unicorn, are there any other HTTP Servers, for Ruby on Rails, that "cleanly" support HTTP streaming?"

Thank you!