What could I do in NSURLConnection -connection:willCacheResponse:?
<p>The documentation says, I can do:</p>

<blockquote>
  <p>Return Value: The actual cached
  response to store in the cache. The
  delegate may return cachedResponse
  unmodified, return a modified cached
  response, or return nil if no cached
  response should be stored for the
  connection.</p>
</blockquote>

<p><strong>What happens when I return cachedResponse unmodified?</strong></p>

<p><strong>Why would I want to return a modified cached response? Examples?</strong></p>
