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authorLoïc Hoguin <[email protected]>2015-02-26 18:55:16 +0100
committerZandra Hird <[email protected]>2015-03-17 11:55:53 +0100
commit7cf85926c11d38ce5ebd181f9f98185f359d64a3 (patch)
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ssl: Add TLS-ALPN support
This commit adds support for RFC7301, application-layer protocol negotiation. ALPN is the standard based approach to the NPN extension, and is required for HTTP/2. ALPN lives side by side with NPN and provides an equivalent feature but in this case it is the server that decides what protocol to use, not the client. When both ALPN and NPN are sent by a client, and the server is configured with both ALPN and NPN options, ALPN will always take precedence. This behavior can also be found in the OpenSSL implementation of ALPN. ALPN and NPN share the ssl:negotiated_protocol/1 function for retrieving the negotiated protocol. The previously existing function ssl:negotiated_next_protocol/1 still exists, but has been deprecated and removed from the documentation. The tests against OpenSSL require OpenSSL version 1.0.2+.
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