I just upgraded to Debian 9 (stretch) but system seems to not support ALPN negociation (after running a HTTP2 test). All guides over the internet still refers to Jessie (Debian 8) but none talks about Stretch (Debian 9).
OpenSSL> version OpenSSL 1.1.0f 25 May 2017 nginx -v nginx version: nginx/1.13.1
nginx was installed from official repository
Is there a simple way (without recompiling manually nginx) to get ALPN with Debian 9 & nginx ?