HTTP/2 is an HTTP version that makes applications faster, simpler, and more robust in comparison with HTTP/1. To be able to use HTTP/2 you need to set up the connection through HTTPS. To make your website support HTTPS, enable the option Secure connection (SSL) on the website creation or edit form. For more information refer to the article Add a WWW-domain.
HTTP/2 is supported only on CentOS 7, CentOS 8, Debian 9, Debian 10, Ubuntu 18, Ubuntu 20. Make sure that your server runs Nginx 1.12 (or later) and OpenSSL 1.0.2k (or later). Read more in Web-servers.
Complete the following steps: