title: Capture the last rendered response and access in backing bean
body: <p>I have a multi-step signup wizard whereby the users progress is tracked as they progress through each step in the wizard and saved to the database on every AJAX request (the entire signup process consists of about 10-20 AJAX updates and finishes with a POST)</p>
  <p>If a user does not complete the signup process we would like to see the rendered view at the point at which they left, this would require us to capture and overwrite the rendered response after each request, when the users signup state is saved we could then store their last response as a string.</p>
  <p>I am just trying to figure out the best way to achieve this, using a <code>PhaseListener</code> at RenderResponse stage or would we need a <code>Filter</code> to capture the raw output? Presumably we could then store output in the Page/Conversation scope so it survives the next request?</p>