Enable HTTP/2

Why? because is faster than old HTTP/1 from 1997. You can chcek your website here and test it.

• HTTP/2 is binary, instead of textual.
• Fully multiplexed, sending multiple requests in parallel over a single TCP connection, asynch
• It uses header compression
• It allows servers to “push” responses proactively into client caches instead of waiting for a new request for each resource
• It uses the new ALPN extension which allows for faster-encrypted connections since the application protocol is determined during the initial connection.
• It reduces additional round trip times (RTT), making your website load faster without any optimization.
• Domain sharding and asset concatenation is no longer needed with HTTP/2.

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Prepare

phpver=php7.3
sudo apt update
sudo apt upgrade
sudo apt-get install $phpver-fpm
sudo a2enmod proxy_fcgi setenvif
sudo a2enconf $phpver-fpm
sudo a2dismod $phpver
sudo a2dismod mpm_prefork
sudo a2enmod mpm_event
sudo a2enmod http2
sudo service apache2 restart

Add at bottom following line to /etc/apache2/apache2.conf:

Protocols h2 h2c http/1.1
H2Push on
H2PushPriority * after
H2PushPriority text/css before
H2PushPriority image/jpg after 32
H2PushPriority image/jpeg after 32
H2PushPriority image/png after 32
H2PushPriority application/javascript interleaved

Explanation: h2 is TLS-encrypted HTTP/2, h2c is cleartext HTTP/2, and http/1.1 is ordinary HTTP/1.1. H2Push on – force HTTP/2 usage. H2PushPriority – defines the priority handling of pushed responses based on the content-type of the response

Go to https://tools.keycdn.com/http2-test and test against your’s website