Setting up HTTP/2 on the Apache HTTP Server with PHP compatibility

Reconciled

Troubleshooting and Reverting

If for any reason you need to revert the entire previous process, follow the step-by-step guide in Table 4.

Table 4

Reverting

Step	Action
1. Stop Apache to ensure a seamless reverting process	`systemctl stop apache2`
2. Delete the `Protocols` directive	Open the Apache config file (`/etc/apache2/apache2.conf`) and remove the line `Protocols h2 h2c http/1.1`
3. Disable the HTTP/2 module	`a2dismod http2`
4. Disable the Proxy module	`a2dismod proxy`
5. Disable FastCGI Proxy module	`a2dismod proxy_fcgi`
6. Remove the PHP FastCGI configuration file	`a2disconf php7.4-fpm` (remember to change the PHP version to your current number)
7. Disable MPM Event	`a2dismod mpm_event`
8. Enable MPM Prefork	`a2enmod mpm_prefork`
9. Enable the original PHP module	`a2enmod php7.4` (remember to change the PHP version to your current number)
10. Start Apache again	`systemctl start apache2`

Infos

Controlling access to your proxy: https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#access

The Author

Eugenia Bahit (she/her) is a theoretical computer scientist and bilingual science writer specializing in Linux programming, software engineering, and high-performance computing.

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