Do I need to install/enable ALPN with HTTP2? How to do it for apache2 ubuntu 16.04?

Question

I just enabled http2 on my ubuntu 16.04 server. When I ran a test on https://tools.keycdn.com/http2-test it verifies that http2 is supported but also gives a warning that "ALPN is not supported".

Di I really need ALPN to take benifits of http2? If yes than how can I install it? I cannot find a way to install/enable/activate ALPN.

Answer 1

Chrome demands ALPN for HTTPS as it has depreciated its predecessor (NPN): https://ma.ttias.be/day-google-chrome-disables-http2-nearly-everyone-may-31st-2016/

Other browsers still support HTTP/2 using NPN I believe (for now).

To use ALPN you need to compile your webserver with OpenSSL 1.0.2 or above. According to that link above Ubuntu 16.04 does support this.