2.2.4.1.3 Polling-Request-Entity-Body
The Polling-Request-Entity-Body is sent from the client to the server with an HTTP POST Request.
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Polling-Request-Entity-Body = Polling-Virtual-Connection-Message; section 2.2.4.1.3.1 / Application-Data; section 2.2.1.1.4
It is possible for the Polling-Request-Entity-Body to contain only the Polling-Virtual-Connection-Message when the client has no data to transfer to the server.
The value in the Polling-Content-Length header field MUST include the size of both the Polling-Virtual-Connection-Message and the Application-Data.