After enabling http2 the website doesn’t work anymore

I just upgraded apache (on Ubuntu 14.04) from 2.4.7 to 2.4.25, and everything was ok, after that I have enabled http2 module and inserted this in my virtual host:

Protocols h2 http/1.1

After that I've tried to open site in browser and it is just loading and loading.

Here are my SSL settings:

SSLEngine on
SSLCertificateFile /etc/letsencrypt/live/*/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/*/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/*/chain.pem

Here is my virtualhost:

DocumentRoot /home/mywebsite
ServerName mywebsite.com

</Directory>


<IfModule mod_php7.c>
        php_admin_flag allow_url_fopen Off
        php_admin_value open_basedir "/home/mywebsite/:/tmp/"
</IfModule>

<IfModule mod_headers.c>
    Header unset ETag
    Header set X-Frame-Options: deny
    Header set X-XSS-Protection: "1; mode=block"
    Header set X-Content-Type-Options: nosniff
    Header set X-WebKit-CSP: "default-src 'self'"
    Header set X-Permitted-Cross-Domain-Policies: "master-only"
    Header edit Set-Cookie ^(.*)$ $1;HttpOnly;Secure
</IfModule>

<IfModule mod_expires.c>
ExpiresActive On
ExpiresByType image/jpg "access 1 year"
ExpiresByType image/jpeg "access 1 year"
ExpiresByType image/gif "access 1 year"
ExpiresByType image/png "access 1 year"
ExpiresByType text/css "access 1 month"
ExpiresByType text/html "access 1 month"
ExpiresByType application/pdf "access 1 month"
ExpiresByType text/x-javascript "access 1 month"
ExpiresByType application/x-shockwave-flash "access 1 month"
ExpiresByType image/x-icon "access 1 year"
ExpiresDefault "access 1 month"
</IfModule>

If I try from curl (curl -I hxxps://mywebsite.com) Im getting this:

Upgrade: h2
Connection: Upgrade

Also I have checked logs (access & error), but there is nothing.

Any ideas, why my website doesn't work after enabling http2 protocol?

If I test mywebsite here: https://tools.keycdn.com/http2-test, it says that my site supports HTTP/2.0.

After changing from LogLevel http2:info to LogLevel http2:debug, I'm getting this in my error.log:

[Wed Jan 25 07:40:25.830096 2017] [http2:debug] [pid 5300] h2_session.c(1007): [client 192.168.1.25:43190] AH03200: h2_session(5) created, max_streams=100, stream_mem=65536, workers_limit=6, workers_max=1, push_diary(type=1,N=256)
[Wed Jan 25 07:40:25.830143 2017] [http2:debug] [pid 5300] h2_session.c(1109): [client 192.168.1.25:43190] AH03201: h2_session(5): start, INITIAL_WINDOW_SIZE=65535, MAX_CONCURRENT_STREAMS=100
[Wed Jan 25 07:40:25.830153 2017] [http2:debug] [pid 5300] h2_session.c(2073): [client 192.168.1.25:43190] AH03079: h2_session(5): started on mywebsite.com:443
[Wed Jan 25 07:40:25.830166 2017] [http2:debug] [pid 5300] h2_session.c(1742): [client 192.168.1.25:43190] AH03078: h2_session(5): transit [INIT] -- init --> [BUSY]
[Wed Jan 25 07:40:25.830196 2017] [http2:debug] [pid 5300] h2_session.c(661): [client 192.168.1.25:43190] AH03068: h2_session(5): sent FRAME[SETTINGS[length=6, stream=0]], frames=0/0 (r/s)
[Wed Jan 25 07:40:25.830206 2017] [http2:debug] [pid 5300] h2_session.c(661): [client 192.168.1.25:43190] AH03068: h2_session(5): sent FRAME[WINDOW_UPDATE[stream=0, incr=2147418112]], frames=0/1 (r/s)
[Wed Jan 25 07:40:25.830248 2017] [http2:debug] [pid 5300] h2_session.c(1742): [client 192.168.1.25:43190] AH03078: h2_session(5): transit [BUSY] -- no io (keepalive) --> [IDLE]
[Wed Jan 25 07:40:25.873960 2017] [http2:debug] [pid 5300] h2_session.c(439): [client 192.168.1.25:43190] AH03066: h2_session(5): recv FRAME[SETTINGS[length=12, stream=0]], frames=0/2 (r/s)
[Wed Jan 25 07:40:25.873992 2017] [http2:debug] [pid 5300] h2_session.c(439): [client 192.168.1.25:43190] AH03066:  h2_stream(5-13): opened
[Wed Jan 25 07:40:25.874084 2017] [http2:debug] [pid 5300] h2_session.c(439): [client 192.168.1.25:43190] AH03066: h2_session(5): recv FRAME[HEADERS[length=331, hend=1, stream=13, eos=1]], frames=7/2 (r/s)




    [Wed Jan 25 08:00:43.593021 2017] [http2:debug] [pid 6637] h2_session.c(439): [client 192.168.1.25:43518] AH03066: h2_session(21): recv FRAME[PING[length=8, ack=0, stream=0]], frames=10/3 (r/s)
[Wed Jan 25 08:00:43.593096 2017] [http2:debug] [pid 6637] h2_session.c(661): [client 192.168.1.25:43518] AH03068: h2_session(21): sent FRAME[PING[length=8, ack=1, stream=0]], frames=11/3 (r/s)