Make your site Class B
Sep 3, 2003
Class B means that all of the traffic to http://www.yourdomain.com is politely and silently redirected to http://yourdomain.com. This is currently the preferred no-www classification as it does not inconvenience your users, but it does assert the deprecated nature of the www subdomain.
The process of making your domain a Class B is quite simple. All you need to do is create or modify a file called .htaccess located in the root directory of your site and add the following lines, changing the red text to match your domain.
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www/.domain/.com$ [NC]
RewriteRule ^(.*)$ http://domain.com/$1 [R=301,L]
在站点http://www.domain.com根目录下建一个.htaccess文件，内容如上。
