2.2.1.4.23 request-context
This token specifies a value whose significance is implementation-specific. A client MAY choose to send this token in GET requests. <35>
The value MUST be an integer in the range from 1 through 4,294,967,295.
This token is defined for use only in requests sent to a server.
The syntax of the request-context token is defined as follows.
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request-context = "request-context=" 1*10DIGIT
The following example shows a first request sent by a client:
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Pragma: request-context=1