Does rails have async controller?

I am trying to write in a way similar to node.js. I would like to use async libraries like concurrent-ruby. The method DoTaskAsync returns a future and I could chain with a then function. The main thread of the calls the original post method could return quickly without being blocked.

class TasksController < ApplicationController
  def post
    DoTaskAsync
    .then do |res|
      respond_to do |format| # possible?
        format.json { render json: res }
      end
    end
  end
end