Link:Hypertext Transfer Protocol version 2
This specification describes an optimized expression of the semantics of the Hypertext Transfer Protocol (HTTP). HTTP/2 enables a more efficient use of network resources and a reduced perception of latency by introducing header field compression and allowing multiple concurrent exchanges on the same connection. It also introduce unsolicited push of representations from servers to clients.HTTP/1.1 message syntax. HTTP's existing semantics remain unchanged. This specification is an alternative to, but does not obsolete, the
https://tools.ietf.org/html/draft-ietf-httpbis-http2-17