title: How do javascript frameworks treat 304 not-modified?
body: <p>I'm curious how this works in Jquery, but also in general.
  When a JS resource is fetched, and the server indicates a 304 not-modified, does a framework:</p>
  
  <ul>
  <li>Load the JS file from cache and execute it</li>
  <li>Not execute it</li>
  </ul>
  
  <p>I'm trying to support a polling solution, and if I can get Jquery to do nothing upon recieving a 304 my work is done, otherwise, I have to write the resource in a safely-reloadable (idempotent) way, which is harder (imagine adding a status div to the page, where you wouldn't want to do that again if the status hasn't changed)</p>