We announced support for HTTP/3, the successor to HTTP/2 during Cloudflare’s birthday week last year. Our goal is and has always been to help build a better Internet. Collaborating on standards is a big part of that, and we're very fortunate to do that here

On the roadmap for ASP .NET Core 2.2, it mentions support for HTTP/2 in Kestrel and HttpClient:

• ASP .NET Core 2.2 Roadmap: https://github.com/aspnet/Announcements/issues/307  

HTTP/2 PUSH is a feature that lets a server pre-emptively push resources to the client (without a corresponding request). HTTP Preload is a way to indicate to the browser resources it would require while loading the current page. In this post, we will discuss the key differences between PUSH and Preload, with a detailed explanation of which one to choose based on your use case. 

HTTP/2 is faster in all the cases than the old standard, and often quite considerably.

Released Today: Visual Studio 2015, ASP.NET 4.6, ASP.NET 5 & EF 7 Previews

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Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.