On the note of exciting news about http2 adoption, I'd recompiled nginx in the Pi Server with HTTP2 support.
nginx version: nginx/1.9.7
built by gcc 4.9.2 (Raspbian 4.9.2-10)
built with OpenSSL 1.0.1k 8 Jan 2015
TLS SNI support enabled
configure arguments:
configure arguments: --with-http_v2_module\--with-http_ssl_module\--with-ipv6--without-http_proxy_module\--sbin-path=/usr/sbin/nginx \--conf-path=/etc/nginx/nginx.conf \--pid-path=/var/run/nginx.pid \--error-log-path=/var/log/nginx/error.log \--http-log-path=/var/log/nginx/access.log