From Hostek.com Wiki
HTTP/2 is a successor to the http/1.1 protocol. It is based on the SPDY protocol and offers some improvements over http/1.1, such as http header compression, server push, multiplexing, and pipelining.
Support for HTTP/2
Below is a Matrix showing support for http/2:
|IIS 7.5 (Windows Server 2008 R2)||No|
|IIS 8.5 (Windows Server 2012 R2)||No|
|IIS 10 (Windows Server 2016)||Yes|
|Apache 2.4.17 and newer||If mod_http2 is enabled|