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Problem:

When accessing HTTP streams, some versions of Windows Media Player (I tested version 8.00.00.4477) send HTTP/1.0 requests which are rejected by NetCache NetApp/5.5D1.

For example, if I open http://live32.cjly.net/ using the "Open URL..." command, WMP8 sends the following request.

GET / HTTP/1.0
Accept: */*
User-Agent: NSPlayer/8.0.0.4477
Host: live32.cjly.net
Pragma: no-cache,rate=1.000000,stream-time=0,stream-offset=0:0,request-context=28902784,max-duration=0
Pragma: xClientGUID={3300****-2C**-46**-AE**-87B4F4******}

(xClientGUID changed to protect the guilty.)

The first line of this request ("GET / HTTP/1.0") is rejected by Shaw Cable's transparent web cache. It returns an error:

HTTP/1.0 400 Bad Request
Server: Cougar 4.1.0.3857
Via: px1ca (NetCache NetApp/5.5D1)

Workaround:

In this particular circumstance, I was able to use a different port number to circumvent Shaw's web cache and reach the server directly. The server accepts the request, and WMP can receive the stream.

Solution:

Since then, Shaw has upgraded to NetCache NetApp 5.6.1D25 which does not exhibit this problem.

Credit:

Ahmed Azhad for noticing that this is a bug in the proxy software, not a bug in Windows Media Player.