How to remove PHP version from the X-Powered-By HTTP header on Plesk server?

Applicable to:

How to remove PHP version from the X-Powered-By HTTP header?

For a specific website:

Log in to Plesk.
Navigate to Domains > example.com > PHP Settings.
Put the following line to the Additional configuration directives section:

CONFIG_TEXT: expose_php = off
Verify that the header is not shown anymore:

# curl -sIL example.com/index.php | grep -c PHP

For all websites using a specific PHP handler:

Connect to the Plesk server via SSH;

Note: If direct SSH access to the server is not possible, contact server administrator for further assistance.
Create a new .ini configuration file in the appropriate PHP directory:

# echo 'expose_php = off' > /opt/plesk/php/X.X/etc/php.d/hideheader.ini
- where X.X - a PHP version, e.g. 5.6, 7.0, 7.1, etc
Reload the Plesk PHP service configuration:

# service plesk-phpXX-fpm reload
- where phpXX - a PHP version, e.g. php56, php70, php71, etc.
Verify that the header is not shown anymore:

# curl -sIL example.com/index.php | grep -c PHP

For webmail:

Connect to the Plesk server via SSH;

Note: If direct SSH access to the server is not possible, contact server administrator for further assistance.
In /etc/psa-webmail/horde/horde/php.ini set expose_php parameter as below:

CONFIG_TEXT: expose_php = Off
Restart Apache:

# service httpd restart
Verify that the header is not shown anymore:

# curl -sIL webmail.plesk.tld/index.php | grep PHP