POST in Http streaming

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I'm trying to understands a little ASF streaming format. The Media Player
sends in the middle of the live video streaming the attached POST packet(see
below).

Why would the Player do that?
Should the server react with opening a new ASF block with the prefix "$h"?
(I couldn't figure out from the documentation at the SDP project)

thanks
Galia

POST / HTTP/1.0
Accept: */*
User-Agent: NSPlayer/11.0.5721.5145
Host: 80.178.22.142
X-Accept-Authentication: Negotiate, NTLM, Digest, Basic
Pragma: client-id=2528285840
Pragma: client-lag=183054
Pragma: stream-switch-count=1
Pragma: stream-switch-entry=ffff:1:1
Content-Length: 0


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