class LetsencryptController < ApplicationController
  def letsencrypt
    # use your code here, not mine
    render text: "MQ5dUiAaSFm8z6_4o3igHp_P-5VcU-jSRU5O-gz6ufM.xQk3L_ZooytfqxYnB78MxA3nMkWHp7bd6j8jAExcZMs"
  end
end

class LetsencryptController < ApplicationController
  def letsencrypt
    # use your code here, not mine
    render text: "GHsKETOLaQ3HUHjD4rJMzhjRnzM8K1Z_y6gXJcszipQ.xQk3L_ZooytfqxYnB78MxA3nMkWHp7bd6j8jAExcZMs"
  end
end

Change url cert is for
Change url cert is for
