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Linkoteca. apache

Enable HTTP/2 module
Apache’s HTTP/2 support comes from the mod_http2 module. Enable it from:

a2enmod http2
apachectl restart

If above commands do not work in your system (which is likely the case in CentOS/RHEL), use LoadModule directive in httpd configuration directory to enable http2 module.
Add HTTP/2 Support
We highly recommend you enable HTTPS support for your web site first. Most web browser simply do not support HTTP/2 over plain text. Besides, there are no excuses to not use HTTPS anymore. HTTP/2 can be enabled site-by-site basis. Locate your web site’s Apache virtual host configuration file, and add the following right after the opening tag:

Protocols h2 http/1.1