ALPN

Application-Layer Protocol Negotiation (ALPN) is a Transport Layer Security (TLS) extension for application layer protocol negotiation. ALPN allows the application layer to negotiate which should be performed over a secure connection in a manner which avoids additional round trips and which is independent of the application layer protocols. It is used by HTTP/2.

ALPN is supported by these libraries.

On July 11, 2014, ALPN was published as RFC 7301. ALPN replaces NPN

TLS False Start was disabled in Google Chrome from version 20 (2012) onward except for websites with the earlier Next Protocol Negotiation (NPN) extension.

...
Wikipedia