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Version: 4.x

adding-www-to-a-url

How do I get www as a prefix in all my Joomla! sites?​

Add the following to your .htaccess file:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^(www\.example\.com)?$
RewriteRule (.*) http://www.example.com/$1 [R=301,L]

A more complete solution fixing several other canonicalisation issues at the same time:

RewriteEngine On
#
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+/)*index\.html?\ HTTP/
RewriteRule ^(([^/]+/)*)index\.html?$ http://www.example.com/$1 [R=301,L]
#
RewriteCond %{THE_REQUEST} !^POST
RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+/)*index\.php\ HTTP/
RewriteCond %{SERVER_PORT}>s ^(443>(s)|[0-9]+>s)$
RewriteRule ^(([^/]+/)*)index\.php$ http%2://www.example.com/$1 [R=301,L]
#
RewriteCond %{HTTP_HOST} !^(www\.example\.com)?$
RewriteRule (.*) http://www.example.com/$1 [R=301,L]