🏒 Lucian Marin
It seems I have to upgrade Sublevel from Ubuntu 14.04 to 16.04 to gain support for HTTP/2. HTTP/2 doesn't work because the current Nginx builds for 14.04 are compiled with OpenSSL 1.0.1 instead of 1.0.2. OpenSSL 1.0.1 doesn't come with ALPN support. Browsers that can't detect ALPN support don't use HTTP/2.