On a couple of freebie servers I notice that when a page doesn't exist (if being spidered for example) then the host doesn't actually return an error 404, but does still produce a page, which effectively has the URL of the page requested. i.e. it seems to be able to throw away the 404 response before coughing up the output. I don't mean a re-direct, or similar, but actually changing the 404 response into (what I guess would be) a 200 response. I know that most servers don't do that, but I'm not even sure how it can be done unless it's some sort of Apache mod - any good info appreciated.