I tried the "100% prevent caching" trick as Anthony had suggested. Here are the headers:
HTTP/1.1 200 OK > Date: Mon, 21 May 2012 20:41:53 GMT > Server: Apache/2.2.22 (Win32) mod_python/3.3.1 Python/2.7.2 > Last-Modified: Mon, 21 May 2012 20:41:53 GMT > Accept-Ranges: bytes > Content-Length: 60991 > Cache-Control: max-age=0, no-cache, no-store, must-revalidate > Pragma: no-cache > Expires: Wed, 11 Jan 1984 05:00:00 GMT > Keep-Alive: timeout=5, max=13 > Connection: Keep-Alive > Content-Type: image/jpeg > > The problem still occurs.
