Odd 200 entry in apache log

I have one strange entry in my apache log:

58.55.42.12 - - [24/Aug/2007:23:58:02 -0400] "GET (snip) HTTP/1.1" 200 6 "-" "Mozilla/4.0 (compatible; MSIE 4.01; Windows 98)"

(where (snip) is the normal base URL for google - I cannot post that here because I am a new member.)

What was this? How/why did it succeed (I'm not google)? I have done some searching for answers, but have not had any luck formulating the right query...

There's nothing in the apache error log that seems to correspond to this entry. This is a new and not-very-public web server; that client found it by a portscan.

Thanks very much for any ideas.

it was probably found by a spider online, so it could have came from a site that you visited.

Thanks infamous. I don't think this was a spider... it was a solitary hit. And the GET request seems to indicate that Google's URL was successfully retrieved (hence the 200) FROM my server. That's why I'm confused: it does not look like a normal Google referral or spider crawl to me. And I don't have any such URL on my site.

I don't know how my server would issue a 200 in response to a GET for a URL I don't host.

Is it some kind of attempted hack or cross-site script, or that kind of thing? Any other thoughts?

Thanks -