You don't need to worry about the programming language in which the client is written. The only reason I am trying to determine your configuration is to properly guide you to install your certificate and private key, which requires some minor changes to your configuration. I'm probably overly-cautious about this step, but since it can cause troubles, I feel the caution is necessary, especially working blind with a newbie. To go a little further, certbot is able to make these changes for you to "install" your certificate, but not knowing your webserver platform can make this process imprecise. It can also rollback the changes if anything goes awry.
If you click on my griffin avatar, a box should pop up with a Message button.