I tried all possible methods that it can be but on oracle linux 8.x i am unable to get strict mode after enabling ssl. I was following the methods described here ORACLE-BASE - Linux HTTP Server Configuration for server setup also added official Cloudflare plugins. i also added that ca_certificate_root.pem with private and origin certificates in the server but still hoping for strict mode to be enabled. it happens every time with ubuntu seamless manner but on oracle Linux 8 it is not happening. I am still stuck with flexible mode. any suggestions will be helpful.