design - Why would SPDY signal its version and packet length in every message? -

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design - Why would SPDY signal its version and packet length in every message? -

while writing thesis on spdy, noticed how much overhead related congestion control. simple window_update packet holds 16 bytes , contains boilerplate contents - packet type, flags, length , actual contents. don't understand engineering science reasong behind - why wouldn't protocol signal version during handshake , rely on info later? why packet size signalled if specification states version of protocol, it's same length?

design version network-protocols low-level handshake

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