CAS Crawler Crawling Code

[Lewis John Mcgibbney]

Hi Folks,
Im sitting jumping between ProductCrawler and StdIngester trying to pin
point _exactly_ where product fetching actually happens.
I'm aware of the triple headed nature of crawler workflows e.g.
preIngestion, postIngestionSuccess and postIngestionFailure... I can see
the logic within the ProductCrawler code... what I cannot locate is where
HTTP/transport socket connections are created and used.
Can anyone please point this out?
Thanks
Lewis