Например, с помощью rewrite правил в .htaccess
RewriteEngine On
RewriteCond %{HTTP_HOST} ^site\.net$ [NC]
RewriteRule ^(.*)$ http://www.site.net/$1 [R=301,L]
Например, с помощью rewrite правил в .htaccess
RewriteEngine On
RewriteCond %{HTTP_HOST} ^site\.net$ [NC]
RewriteRule ^(.*)$ http://www.site.net/$1 [R=301,L]
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