Enable http/2

[stevenrombauts]

Enable http/2 protocol.

Links:

• https://httpd.apache.org/docs/2.4/howto/http2.html
• http://nginx.org/en/docs/http/ngx_http_v2_module.html

[stevenrombauts]

Installing and enabling the http2 module in Apache:

# Create the .load config file
echo "LoadModule http2_module /usr/lib/apache2/modules/mod_http2.so" | sudo tee /etc/apache2/mods-available/http2.load

# Enable the module
sudo a2enmod http2

# Enable the h2 protocol
echo -e "\nProtocols h2 http/1.1\n" | sudo tee -a /etc/apache2/apache2.conf 

# Restart Apache
box server:restart apache2

On your host machine, verify that the connection is now upgraded to HTTP/2 by checking the output from this cURL request:

curl --http2 -sI -k https://joomla.box/ -o/dev/null -w '%{http_version}\n'

It should return 2 (http version).

If it's not working, double check that Apache is not using the prefork MPM module:

sudo apache2ctl -M | grep prefork

If yes, disable it with sudo a2dismod prefork and replace by worker sudo a2enmod worker