Varnish: Only apply Safari work-around to drupal generated pages and do not touch static assets (like e.g. css, js, images)

Vincent Massaro authored Oct 07, 2013 and znerol committed Oct 08, 2013

Change the example.vcl file such that commented out optional parts
compile when enabled:
* Converted single quotes to double quotes
* Fix header set syntax
* Changed URL in code to match comment

Varnish: Add session-cookie to hash data instead of enforcing Vary: Cookie on key-retrieval requests

Varnish: Add smart ban on key-retrieval callback after POST requests (and allow messages to be shown after content was modified)