HTTP/2 is an optimization of HTTP 1.1. Many browsers already support HTTP/2; your Chrome browser does that already.
HTTP/2 is a combination of two specifications: Hypertext Transfer Protocol version 2 (RFC7540) and HPACK- Header Compression for HTTP2 (RFC7541).
When using HTTP/2 over Transport Layer Security (TLS), "h2" is used to indicate the protocol.
The "h2c" string is used when HTTP/2 is used over clear text TCP or when HTTP.1.1 upgrades.
An example of a GET request is as follows:
GET / HTTP/1.1
Host: server.example.com
Connection: Upgrade, HTTP2-Settings
Upgrade: h2c
HTTP2-Settings: <base64url encoding of HTTP/2 SETTINGS payload>
Host: server.example.com
Connection: Upgrade, HTTP2-Settings
Upgrade: h2c
HTTP2-Settings: <base64url encoding of HTTP/2 SETTINGS payload>
-RCF 7540 Section 3.2
This request is from a client that does not know whether HTTP/2 is supported. It makes a HTTP 1.1 request, but includes an upgrade field in the header, "h2c", and at least...
