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you can try ‘request’ hook:

add_filter('request', function( $vars ) {

    $request = urldecode($_SERVER['REQUEST_URI']);
    if ( stristr($request, '/YOUR_SLUG') != false ) {
        ...
    }
}

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