Every website should have this implemented. It forces your site to always show the triple w’s before your domain.
This prevents search engines from indexing your site twice and showing duplicate content, which could have a negative impact in your page ranking.
Options +FollowSymLinks
RewriteEngine onRewriteCond %{HTTP_HOST} ^domain.com [NC]
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R=301]
Add the above code to your .htaccess [...]

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