<IfModule mod_rewrite.c>
RewriteEngine On  
RewriteBase /  
RewriteCond %{HTTP_HOST} ^www.duoshengyi.com$ [OR]  
RewriteCond %{HTTP_HOST} ^www.duoshengyi.com$  
RewriteRule ^(.*)$ http://www.duoshengyi.com/$1 [R=301,L] 
</IfModule>
