Asset Packaging asset_hosts

production.rb

  ActionController::Base.asset_host = Proc.new { |source|
    img = %w(.png .jpg .gif .jpeg)
    ext = File.extname(source).split("?")[0]

    if img.include?(ext)
      "http://assets1.example.com"
    elsif ext == '.js'
      "http://assets2.example.com"
    elsif ext == '.css'
      "http://assets3.example.com"
    else
      "http://assets4.example.com"
    end
  }