2.2.1.4.7 expect-new-header
This token is used as a notification from the server to the client that the $M (section 2.2.3.6) and $H (section 2.2.3.5) packets, which are sent as the first packets in the response to the Play request, will be immediately followed by a $C packet (section 2.2.3.2) and another $M and $H packet.
This token is defined for use only in responses sent to a client.
The syntax of the expect-new-header token is defined as follows.
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expect-new-header = "expect-new-header=" ("0" / "1")
Example:
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Pragma: expect-new-header=1