->

Call MsgIn ( Msg : 
                   Call MP Msg 'Thread_context' Msg.Layer_id
           )
With Thread_context = . ..

Exit

MP ->
Arg Message : HTTPMessage, TC : &Variables, Layer : HTTP_POST

Call HTTPRequest Message 'Request',
     CheckUser Request Layer,
     Process Request 'TC'

Return

MP ->
Arg Message : HTTPMessage, Layer : HTTP_GET

...

Return