2.2.4.1.3.1 Polling-Virtual-Connection-Message
The Polling-Virtual-Connection-Message is the additional data pre-pended to the Application-Data to uniquely identify the Entity-Body on a client and a server.
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Polling-Virtual-Connection-Message = Polling-Encapsulation-Version NUL; section 2.2.4.1.3.1.1 Relay-Server-URL NUL; section 2.2.4.1.3.1.4 Virtual-Connection-GUID NUL; section 2.2.1.1.1 Sequence-Number NUL; section 2.2.4.1.3.1.2 Checksum NUL; section 2.2.4.1.3.1.3