To use eConf, the teacher has to disable its internal
cache to force the browser to reload a page each time
it's served.
However, sometimes HTTP code 304 is sent by the web
server (page is in memory for instance, it's browser
implementation dependent).
In that case, the proxy crashes and sent a "null" reason
to the client. Reason is unknown and further
investigation should be made with the W3C JigSaw
support.
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Proxy should never send http response saying the file is up to
date