module ActionController::Streaming

def _process_options(options)

Set proper cache control and transfer encoding when streaming 
def _process_options(options)
  super
  if options[:stream]
    if request.version == "HTTP/1.0"
      options.delete(:stream)
    else
      headers["Cache-Control"] ||= "no-cache"
      headers["Transfer-Encoding"] = "chunked"
      headers.delete("Content-Length")
    end
  end
end

def _render_template(options)

Call render_body if we are streaming instead of usual +render+. 
def _render_template(options)
  if options.delete(:stream)
    Rack::Chunked::Body.new view_renderer.render_body(view_context, options)
  else
    super
  end
end