health_controller.rb

class HealthController < ApplicationController
  def index
    results = {:status => "ok"}
    respond_to do |format|
      format.html { render :status => 200, :html => "ok" and return }
      format.json { render :status => 200, :json => results.to_json and return }
    end
  end
end

# This is called from a routes file like this:

Rails.application.routes.draw do
  get '/health', to: "health#index"
end