!!! Overview[1]
[{$pagename}] ([ALPN]) is defined in [RFC 7301] as a [Transport Layer Security] ([TLS]) [TLS extension] for application layer protocol negotiation. 

[{$pagename}] allows the [Application Layer] to negotiate which [protocol] should be performed over a [secure connection] in a manner which avoids additional round trips and which is independent of the [Application Layer] [protocols].

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Application-Layer_Protocol_Negotiation|Wikipedia:Application-Layer_Protocol_Negotiation|target='_blank'] - based on information obtained 2017-03-15-