Cache warming in drupal7 I have a drupal 7 website that uses Varnish for caching (through drupal's Varnish module).
 I want a cache warming mechanism that would automatically cache the latest version of the pages after the cache expiration time has passed. 

How can i do this?
You could try the cache warmer module, which apparently does just that.

There are also a bunch of blog posts on the topic around the web.