I start bitcoind 0.17 in a particular port on Ubuntu 18.04 VPS server. I want to give the SSL certificate for RPC port. I already know to generate self signed certificate using OpenSSL. But I don't know how to apply SSL on a particular port. Please give any idea about that.

Also refer the following link for applying ssl using Apache. https://bitcoin.org/en/release/v0.12.0#rpc-low-level-api-changes

But it is not working. I thing it is an old document. Any new documents are available to archive my target.

Thank-you...