When streaming media using Windows Media Player the content shows as cached, however the content results with 0% bandwidth savings when replayed.
This is caused by Windows Media Player not honouring the ProxySG cache settings by including in the initial request a Cache-Control header with the variable set to No-Cache':
Hypertext Transfer Protocol
GET /video.wmv HTTP/1.1\r\n
[Expert Info (Chat/Sequence): GET /video.wmv HTTP/1.1\r\n]
[GET /video.wmv HTTP/1.1\r\n]
[Severity level: Chat]
Request Method: GET
Request URI: /video.wmv
Request Version: HTTP/1.1
>> Cache-Control: no-cache\r\n
User-Agent: NSPlayer/12.00.7601.17514 WMFSDK/12.00.7601.17514\r\n
To mitigate this you would need to enable cacheing for your version of Windows Media Player, please visit http://www.microsoft.com for more information.