According to my understanding of the manpages (specifically httpd.conf(5) and tls_config_set_protocols(3)), setting up TLSv1.3 should be just as easy as adding:
tls { protocols "TLS_PROTOCOL_TLSv1_3" } to the appropriate server in /etc/httpd.conf . But when I do this, httpd(8) doesn't come up. Clearly I'm not setting the right variable, but what is that variable to set? - Parker