how SameSite attribute added to my Asp.net_SessionID cookie automatically?

Question

Recently samesite=lax add automatically to my session cookie! this attribute just add to sessionID: \"Set-Cookie ASP.NET_SessionId=zana3mklplqwewhwvika2125; path=/; H

Answer 1

I can't use rewrite, because UrlRewrite not installed on all my customers servers.

Finally i add cookieSameSite to my web.config: