Rule from network under performance category
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ALPN (Application Level Protocol Negotiation) allows the clients to dictate which protocols can be used, and have the server simply respond with a supported protocol. This allows both the handshake and response to take place on a single request.
ALPN replaces the older protocol NPN (Next Protocol Negotiation). As of Chrome 51 (May/June 2016) NPN has been deprecated in favour of ALPN.
Ensuring that your web server is handle ALPN gives a bit of a performance boost as clients do not need to try and figure out which protocol could be best to use.
How website owners / developers go about enabling ALPN will differ:
./configure --with-http_spdy_module --with-http_v2_module --with-http_ssl_module.
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