When you log on a web app based on ABAP system (e.g. Fiori Launchpad, Web GUI), you find the cookie SAP_SESSIONID_<system ID>_<client number> has the path '/' (root).
SAP NetWeaver ABAP
SAP NetWeaver all versions ; SAP S/4HANA all versions
cookies, root path , KBA , BC-SEC-LGN , Authentication , Problem
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