[
        {msgLen, MsgLen},
        {msgType, MsgType},
        {circuitId, CircuitId},
        {requestId, ReqId},
        {payload, Rest3}

    [ {msgLen, MsgLen}
    , {msgType, MsgType}
    , {circuitId, CircuitId}
    , {requestId, ReqId}
    , {payload, Rest3}

        true -> [
            {header, proplists:delete(payload, Header)},
            {ttl, Ttl},
            {hashes, Hashes}

        true ->
        [ {header, proplists:delete(payload, Header)}
        , {ttl, Ttl}
        , {hashes, Hashes}

    [   {header, proplists:delete(payload, Header)}
    ,   {ttl, Ttl}
    ,   {cancelid, CancelId}

    [ {header, proplists:delete(payload, Header)}
    , {ttl, Ttl}
    , {cancelid, CancelId}