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well, this was a strange one. I have 404's redirected to a custom
HttpHandler. This is done in order to fake locations of downloaded files.
The looks at the request url, determines if it is for a file download and
sends a file if appropriate. For actual 404's the code would redirect
rather than sending a status code of 404 and closing the response. The page
was getting a 404 for a spacer image and this redirect bug was causing the
issue.