HTTP/2 – Hyper Text Transfer Protocol version 2.0 is a major revision of the HTTP network protocol used by the World Wide Web (WWW). HTTP/2 (standardized in 2015) is the first new version of HTTP since HTTP/1.1, which was standardized in RFC 2068 in 1997.
HTTP/2 enables full request and response multiplexing. In practice, this means a single TCP connection made to a web server from your browser can be used to send multiple requests and receive multiple responses when using HTTP/2 as opposed to HTTP1 which loads a single request for every TCP connection. This makes HTTP/2 much faster and more reliable than HTTP1.
5G adopts HTTP/2 as application layer protocol which means all the network entities in control plane will communicate with each using HTTP/2.