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session(ID) from the current
HTTP request (see http_current_request/1). The value is cached
in a backtrackable global variable
http_session_id. Using a
backtrackable global variable is safe because continuous worker
threads use a failure driven loop and spawned threads start
without any global variables. This variable can be set from the
commandline to fake running a goal from the commandline in the
context of a session.