I was struggling with ESI today, when I stumbled uponthis SO question.
The cookbook entry about ESI doesn't talk about session cookies, and it seems thatthey prevent cache lookups (when in the request) and caching (when in the response) (at least when you start from the default VCL configuration and apply the changes documented in the cookbook entry).
Following the cookbook entry leads to a working html page, but with no caching. Shouldn't this be documented ?