lucy24 - 11:25 am on Feb 2, 2012 (gmt 0)
I needed to test something about a particular Preview of one of my own pages. The Preview came with a blurb saying something about showing a cached version. This kinda implies that there also exist non-cached Previews.
Possibly the Previewbot figured out that I was rewriting it from a 700K page to a 35K mockup which looks exactly the same. I deliberately searched for a unique phrase that occurs late in the (complete) file. Odd thing is, the logs show a filesize that's even smaller-- though still much bigger than any detour or error document. But it comes through as 200 so they must have got something.
And yes, the referer line is the "search" version. I tend to take that at face value. The stylesheet had a normal referer, same as when a human views the page.