Why HTTP/2 need to update?
HTTP/2 is much faster than HTTP/1.1.
The HTTP/2 protocol achieves this by enabling web browsers to send multiple, simultaneous requests to the server. In order to make use of HTTP/2, you must jump through a few steps.
Requirements
Unfortunately, the Apache2 installation in Ubuntu Server defaults to HTTP/1.1.Your web server must be making use of HTTPS, so you'll need to have an SSL certificate installed. Self-signed certificate, because you can not do this, you must use a tool such as Let 's Encrypt.
See : How to install and use Let's Encrypt on a Ubuntu Server.
You must install at least version 2.4.26 of the Apache. As with previous versions HTTP / 2 it is not a production-ready.
Installation
To upgrade Apache2 to this version, issue the following commands:sudo apt install software-properties-common
sudo add-apt-repository ppa:ondrej/apache2
sudo apt update
sudo apt install apache2
Enable the HTTP/2 module
Now that you've taken care of the requirements, you can enable the HTTP/2 module with the command:sudo a2enmod http2
With that module enabled, restart Apache2 with the command:
sudo systemctl restart apache2
Enable your sites
The next step will be to enable your sites to make use of HTTP/2. This will work for those sites you've enabled HTTPS.For the sake of simplicity, let's say you've enabled the default site to work with HTTPS.
The configuration for this will be found in /etc/apache2/sites-enabled/000-default-le-ssl.conf.
Note: All sites in which you've enabled HTTPS, via Let's Encrypt, will end with le-ssl.conf.
Issue the command :
sudo nano /etc/apache2/sites-enabled/000-default-le-ssl.conf
and add the following tag after the <VirtualHost *.443> directive tag:
Protocols h2 http:/1.1
Save and close that file. Restart Apache2
sudo systemctl restart apache2
If you handle all the requirements Apache server should now be able to work with HTTP / 2 protocol.
Thanks for being here : Need help for enable Apache HTTP/2
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