Since the arrival of WordPress 2.9, the “canonical” element is automatically generated in your website’s header. While it is an excellent way to tell some search engines not to index certain pages (lets presume for a second that search engines really listen ), there some instances you my not necessarily want the “canonical” element generated on your website. Instead of helping your SEO efforts, the canonical element may actually hurt your website.
If you use Datafeedr Plugin with current (or 2.9+) version of WordPress, you might need to consider doing some tweaking to your WordPress installation. Why? Because every “product page” on your website has canonical link element in the header pointing to your “store page”. What does it mean? Well, it is like asking search engines not to index your “product pages”.
So how do you tell your WordPress not to generate canonical link element in the header?
One way you can do it is by modifying your theme’s functions.php file – this method however did not work on my WordPress 3.0 installations.
Another way you can disable canonical element is by modifying your “wp-includes/default-filters.php” file. All you need to do is to find the line 197 that says:
add_action( 'wp_head', 'rel_canonical' );
and change it to:
//add_action( 'wp_head', 'rel_canonical' );
You can delete that line entirely if you wish. But you need to do this every time you are upgrading/reinstlling your WordPress.
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