ActionController::Live::Response partial <code>process</code> that happens on every "live" request

response_process.rb

error = nil
# This processes the action in a child thread. It lets us return the
# response code and headers back up the rack stack, and still process
# the body in parallel with sending data to the client
Thread.new {
  begin
    super(name)
  rescue => e
    if @_response.committed?
      begin
        complete = ActionView::Base.streaming_completion_on_exception
        @_response.stream.write(complete) if request.format == :html
        @_response.stream.call_on_error
      ensure
        @_response.stream.close
      end
    else
      error = e
    end
  ensure
    @_response.commit!
  end
}
@_response.await_commit
raise error if error