Forcing Rails to Think a Request is Using SSL

application.rb

# app/controllers/application.rb

class ApplicationController < ActionController::Base
  before_filter :modify_protocol

  private 

  def modify_protocol
    returning(true) do
      if Rails.configuration.protocol_modifier
        request.extend(Rails.configuration.protocol_modifier) 
      end
    end
  end
end

duplicity.rb

# lib/duplicity/force_ssl.rb

module Duplicity
  module ForceSSL
    def protocol
      'https://'
    end
  end
end

environment.rb

# config/environment.rb

module CustomConfiguration
  attr_accessor :protocol_modifier
end

Rails::Initializer.run do |config|  
  config.extend(CustomConfiguration)

  # standard configuration elided for clarity
end

production.rb

# config/environments/production.rb

config.protocol_modifier = Duplicity::ForceSSL