If you encounter an error message “412 Precondition Failed”
on your website, it means that particular page
request clashed with one of the security rules implemented on our
server. These rules are generally implemented to protect the websites
hosted over the server from malicious activities.
The most likely cause of this response is a mod_security setting. The mod_security module will display the error when a portion of the web request data that one of our servers received is suspected to be malicious.
In order to disable this security feature you can add this line to your .htaccess file:
SecFilterEngine Off