I looked at this example server certificate in the Boost.Beast repository: https://github.com/boostorg/beast/blob/develop/example/common/server_certificate.hpp .  I have a free SSL certificate that I got for my Dynamic DNS subdomain name which doesn't have DH parameters but does have a certificate chain and a private key.  I don't know what to put for ctx.set_options or ctx.set_password_callback.  I tried asking at Let's Encrypt as well: https://community.letsencrypt.org/t/how-to-secure-dynamic-dns/87816/19 .  I decided to ask here because they said they can't advise me on how to do it with Boost.  I don't want to try a reverse proxy.  

My current web server code can be found here: https://github.com/DragonOsman/currency_converter/blob/master/currency_converter.cpp .