4.2 HTTP Layer Teardown
After the SSTP finite state machine (FSM) is completed, it performs its own teardown. When the teardown is completed, the SSTP FSM signals the HTTP layer to tear down itself.
The teardown of the HTTP connection layer is done by signaling the request/response completion. The client closes the request to indicate that no data transfer is expected on it. If the server is initiating the disconnect, then it indicates the end of the entity body to the HTTP layer. The HTTP layer closes the TCP connection appropriately.