Can anyone suggest how I get non www traffic to redirect to the www version of a website using the htaccess file - I know I have one created in my root directory but cannot be sure what to put.. any ideas
Relatively easily.
Match anything that does not begin with 'www.' and then redirect to the 'www.' version:
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
来源：https://stackoverflow.com/questions/9314520/htaccess-get-all-non-www-traffic-redirected-to-the-www