2.2.1.4.14 packet-pair-experiment
This token is used by clients to request that the server start a packet-pair experiment. It is also used by servers to indicate whether they will comply with the request.
This token MUST have a value of either 0 or 1.
If this token is not specified, a value of 0 MUST be assumed.
This token is defined for use only in requests sent to a server with a version greater than or equal to 5.0 (as specified by the server in the Server header).<28>
The syntax of the packet-pair-experiment token is defined as follows.
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packet-pair-experiment = "packet-pair-experiment=" ("0" / "1")
Example:
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Pragma: packet-pair-experiment=1