Page not found error when adding text `2 = 2 ^ 1` to the page

This is an issue when installing mod_security2.

The solution is as simple as disabling mod_security or allowing that page to POST that request.

The issue is that mod_security thinks someone is trying to hack into your site.

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)