Completely confounded by Rails 3.2.3, the asset pipeline, and a custom asset host :-(

gistfile1.rb

# config/environments/production.rb

  # Enable serving of images, stylesheets, and JavaScripts from an asset server
  config.action_controller.asset_host = "//#{ENV.fetch("FOG_DIRECTORY")}.s3.amazonaws.com"

# app/views/layouts/application.erb

  <%= javascript_include_tag :application %>

# Resulting HTML (in heroku, with RAILS_ENV=production):

  <script src="/assets/application-7ab84bc8e150bcc5d29d61ca6dce119e.js" type="text/javascript"></script>

# WTF, Rails, WTF?! (aka: what am I missing?!) Why isn't the asset served from "//blah.s3.amazonaws.com"?!?!?!