Our HTTP/2 options behave differently depending on whether you’re using an NGINX server or an OpenLiteSpeed web server.
When using an NGINX web server, HTTP/2 is an option that is only available AFTER SSL is enabled. It will be visible under the SSL tab for sites.
However, there are some important limitations:
You can turn it [HTTP/2] on as follows:
When using an OpenLiteSpeed web server, HTTP/2 is automatically enabled and disabled when SSL is enabled/disabled.