lucy24 - 5:43 am on Jan 12, 2012 (gmt 0)
Continuing on the theme of google and referers, with a side of Things You Only Notice If You're Small:
Midway through the 5th (my time, which happens to correspond to google's time zone) Preview suddenly started sending a referer. For the initial html, that is. Previously it was - blank; now it's http://www.google.com/search without parameters.
Unlike the image-harvesting googlebot, which called for Regular Expression searches through my raw logs, this one is visible to the naked eye-- especially if, like me, you color-code your processed logs ;)
Two specific pages happen to show up both "before" and "after". Neither of them were changed during that time period, which suggests google doesn't bother to cache Previews for my site, but just runs them up on the fly. Or, alternately, they're only cached for a few hours. I know this is the case with Translate, which often behaves similarly to Preview.
So now I officially know what I already knew: that a Preview is the result of a search. But not what I'd really like to know: what the person was searching for.