Apex domain redirect in Rails 4

application_controller.rb

class ApplicationController < ActionController::Base
  # Prevent CSRF attacks by raising an exception.
  # For APIs, you may want to use :null_session instead.
  protect_from_forgery with: :exception

  before_filter :check_domain_and_ssl
  
  def check_domain_and_ssl
    if Rails.env.production? and (request.protocol.downcase + request.host.downcase) != 'https://www.mywebsite.com'
      redirect_to 'https://www.mywebsite.com' + request.fullpath
    end
  end

end