//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under
// the terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0
//
// This Source Code may also be made available under the following
// Secondary Licenses when the conditions for such availability set
// forth in the Eclipse Public License, v. 2.0 are satisfied:
// the Apache License v2.0 which is available at
// https://www.apache.org/licenses/LICENSE-2.0
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

[[alpn-chapter]]
== Application Layer Protocol Negotiation (ALPN)

The development of new web protocols such as HTTP/2 raised the need of protocol
negotiation within a Transport Layer Security (TLS) handshake.
A protocol negotiation called ALPN (Application Layer Protocol Negotiation -
https://tools.ietf.org/html/rfc7301[RFC7301]) has been defined to accomplish this.

ALPN has now replaced the older (and now fully deprecated) NPN in the general Web
as of 2016.

For those browsers that support HTTP/2, they all now support ALPN.
Starting with Jetty 9.3.0, only ALPN is supported by Jetty.

include::alpn.adoc[]
