Hi,

I tried this one:
http.conf:
listen 192.168.1.161:80;

https.conf:
listen 192.168.1.162:443 ssl;

http2.conf:
listen 192.168.1.163:443 ssl http2;

Looks like it solve issue especially when I do request for the first time. For the second time in IE I can get https in place of http2. Firefox mostly do not provide such behaviour. May it lay on certificate? I use the same certificate for both HTTPS and HTTP2. And certificate was issued for server hostname not for vhost IP.