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You are here:Home » Fix HTTP/2 NOT Working on Apache 2.4 Running WordPress

By Abhishek Ghosh September 9, 2020 9:55 am Updated on September 9, 2020

Fix HTTP/2 NOT Working on Apache 2.4 Running WordPress

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If you have followed older guides to configure the server to install WordPress, then you have followed the guides to install Mod PHP with MPM prefork. presently, the usual mod_php and prefork MPM module of Apache2 does not work with HTTP/2 module. The default prefork MPM is not fully compatible with HTTP/2. If you are running Apache alongside the mod_php module, you need to switch to PHP-FPM. You need to uninstall the prefork MPM and switch to the mpm_event module which will be supported by HTTP/2. Apache2 is always easy. All you have to do is running some commands to do the things we mentioned above and remember what you have done. In case you want to switch back to mod_php with MPM prefork, that is just easy. In short – if you are following this guide then bookmark it.

 

How to Enable HTTP/2 on Apache 2.4 for PHP/WordPress

 

If you are not using the PPA from Ondřej Surý then do these steps :

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sudo add-apt-repository ppa:ondrej/apache2
sudo apt update
sudo apt upgrade

We are writing the commands for PHP 7.0, you can modify and use it for PHP 7.1, PHP 7.2, PHP 7.3, PHP 7.4 and so on. We are changing mod_php to php-fpm (PHP FastCGI). The setup will be somewhat like Nginx – you have to manually restart PHP-FPM and Apache2 for many settings to work.

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sudo apt install php7.0-fpm
# Enable proxy_fcgi and setenvif
sudo a2enmod proxy_fcgi setenvif
# Enable php7.0-fpm
sudo a2enconf php7.0-fpm
# Disable the mod_php module
sudo a2dismod php7.0
# Restart Apache2
sudo service apache2 restart
# Disable the "prefork" MPM
sudo a2dismod mpm_prefork
# Enable the "event" MPM
sudo a2enmod mpm_event
# Restart the services
sudo service apache2 restart
sudo service php7.0-fpm restart
# Enable HTTP/2 module
sudo a2enmod http2
# Restart Apache2
sudo service apache2 restart

 

Basic optimization

 

Inside the /etc/apache2/mods-enabled/ directory, you’ll get the configuration files for mpm_event, http2 etc.

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cd /etc/apache2/mods-enabled/
ls

You can open the file and modify :

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sudo nano /etc/apache2/mods-enabled/http2.conf

You can run a configtest :

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sudo apachectl configtest
# and restart apache
sudo service apache2 restart

This is all default enabled http2.conf file :

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<IfModule !mpm_prefork>
    Protocols h2 h2c http/1.1
    H2Direct on
    H2Push          on
    H2PushPriority * After 16
    H2PushPriority  *                       after
    H2PushPriority  text/css                before
    H2PushPriority  image/jpeg              after   32
    H2PushPriority  image/png               after   32
    H2PushPriority  application/javascript  interleaved
</IfModule>

Explanation is available on the official doc :

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https://httpd.apache.org/docs/2.4/mod/mod_http2.html

Now open the mpm_event.conf file :

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sudo nano /etc/apache2/mods-enabled/mpm_event.conf

This is optimized settings for a 16GB server :

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<IfModule mpm_event_module>
        ServerLimit              2800
        StartServers             4
        MinSpareThreads          25
        MaxSpareThreads          75
        ThreadLimit              64
        ThreadsPerChild          25
        MaxRequestWorkers        2800
        MaxConnectionsPerChild   1000
</IfModule>

Now about PHP FPM (which is exactly like we do with Nginx) :

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nano /etc/php/7.0/fpm/pool.d/www.conf

This should be enough for a 16GB server :

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pm = dynamic
pm.max_children = 256
pm.start_servers = 20
pm.min_spare_servers = 10
pm.max_spare_servers = 20
;pm.process_idle_timeout = 10s;
pm.max_requests = 1000

Restart the services:

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sudo service php7.0-fpm restart
sudo service apache2 restart

Fix HTTP2 NOT Working on Apache 2-4 Running WordPress

 

How to revert back?

 

The easy way is to run the opposite commands, like a2dismod against previous a2enmod and vice-versa. However, it is practical to take a backup of all the configuration files of Apache, purge everything and freshly install Apache2 and PHP. Unlike Nginx, PHP-FPM does not hugely disturb with Apache.

Tagged With apache prefork http2
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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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