HTTP/2 is a new version of the internet protocol originally developed by Google (SPDY). This plugin enables to make use of some it's optimization potential.

Test your website for HTTP/2 support
HTTP/2 Server Push

When enabled, resources such as scripts, stylesheets and images can be pushed to visitors together with the HTML (documentation).

Insert WordPress scripts WordPress stylesheets HTML images Custom resource list
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Note: When using the Progressive Web App Service Worker (PWA), the service worker automatically calculates a Cache Digest based on previously pushed resources. This feature is based on the hash calculation implementation of Cache-Digest-Immutable and enables the server to only push resources that aren't already available in the client. For more information, see this article on PerfPlanet.com.

Cache-Digest

It is not possible to push resources that are not used on a page. For more information, see this article