What I meant was this is my original.
listen 443 ssl http2;
listen [::]:433 ssl http2;
I noticed yours is httpd. So do I change it to httpd like yours?
About 433, I know it has to be 443 but unclear about httpd and http2.
Also in my listen_ssl_back.conf file:
listen 8433;
listen [::]:8433;
Do I just change it to this?
listen 8443;
listen [::]:8443;
or
listen 8443 ssl http2;
listen [::]:8443 ssl http2;