Redirect all www addresses to non-www web addresses

Question

How can I redirect all traffic from www.domain.com/page to domain.com/page?

I need to disallow traffic to web addresses that include the www. The reason is that I have an SSL certificate that only works with non-www web addresses. If users try to access https://www.domain.com, they get a certificate error.

Answer 1

Uncomment lines 93 and 94 in the .htaccess file that comes with Drupal in the web root.

RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewiteRule ^ http://%1%{REQUEST_URI} [L,R=301]

EDIT: If the certificate requires https, edit the second line to read:

RewiteRule ^ https://%1%{REQUEST_URI} [L,R=301]

Answer 2

This is how you can achieve that in Drupal 7, editing your .htaccess

# To redirect all users to access the site WITH the 'www.' prefix,
# (http://example.com/... will be redirected to http://www.example.com/...)
# uncomment the following:
# RewriteCond %{HTTP_HOST} .
# RewriteCond %{HTTP_HOST} !^www\. [NC]
# RewriteRule ^ http%{ENV:protossl}://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#
# To redirect all users to access the site WITHOUT the 'www.' prefix,
# (http://www.example.com/... will be redirected to http://example.com/...)
# uncomment the following:
RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
RewriteRule ^ http%{ENV:protossl}://%1%{REQUEST_URI} [L,R=301]