Force www vs non-www to avoid duplicate content on Google

Recently, it has been talked a lot about Google and duplicate content as well as Google Canonical problems.That is, when you have your site accessible both under and To avoid such problems you can use the following lines in your .htaccess file to force only the www version of your web site:

RewriteEngine on
RewriteCond %{HTTP_HOST} !^$
RewriteRule ^(.*)$$1 [R=301]

Please, note that the .htaccess should be located in the web site main folder.

This will redirect all requests to the non-www version of your site to the www version using 301 Permanent redirect which will make the search engines to index your site only
using the URL. In this way you will avoid a duplicate content penalty.

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