title: Rails 3 - Is there any fallback for when serving assets from an asset server fails?
body: <p>In my <code>production.rb</code> I've set this:</p>
  
  <pre><code># Enable serving of images, stylesheets, and JavaScripts from an asset server
    config.action_controller.asset_host = "http://myassets.com"
  </code></pre>
  
  <p>And the images, js and stylesheets are loading fine from my CDN (assets server)</p>
  
  <p>but what if someday this asset servers fails? and it returns a 404?</p>
  
  <p>Because in my assets server (CDN) I have configure a <code>pull zone</code>, the content is still available from <code>/assets/..</code>.</p>
  
  <p>Is there any fallback or how can I make a fallback so when my <code>assets server</code> fails or return error my application loads assets from <code>/assets/</code> inside the application?</p>