Hans Hübner wrote:
I'd set HUNCHENTOOT:*HEADER-STREAM* to *STANDARD-OUTPUT* and *BREAK-ON-SIGNALS* to 'WARNING, then wait for the Googlebot request to come in. The headers printed to the console may give you a clue what the request looks like and maybe a way to initiate such a failing request yourself, maybe with Drakma or wget. You'll may also be able to get a clue from looking at the backtrace in a debugger.
Good suggestion, Hans. I found a contraction inside a meta content string which was demarked with single quotes.
I find it curious that Google retries every five minutes. Did you verify that the request is coming from a Google IP address? It may also be a prankster's script gone wild, in which case I'd block the IP address.
It is curious. I'd checked it right off - it is a Google IP address. Seems like a terrible waste of their bandwidth.
--Jeff