Ok, let me refine my question more.
I read that "MAC-info" header is used to provide message authentication to the client. This calculation involves the message bits and other things.
If anyone has worked with security and crypto, then can you tell me if the message bits considered for this mac calculation be according to the range of bytes specified by the client in the "range:" header? Or am i wrong fundamentally somewhere?
Any resourse pointed out would be great.