Knowledge base

Apache

In the Web server configuration file, or the .htaccess file, append the following commands:

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www\.(.*) [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

or

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.mydomain\.com$ [NC]
RewriteRule ^(.*)$ http://mydomain.com/$1 [R=301,L]

Both options are acceptable.

A reverse redirect (from mydomain.com to www.mydomain.com) is carried out using commands:

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.(.*) [NC]
RewriteRule ^(.*)$ http://www.%1/$1 [R=301,L] 

or

Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^mydomain\.com$ [NC]
RewriteRule ^(.*)$ http://www.mydomain.com/$1 [R=301,L]

Both options are acceptable.

Restart the Apache Web server using the command:

apachectl restart

or

apache2ctl restart

Nginx

In the Nginx Web server configuration file, make the following changes.

Add section:

server {
     listen  80;
     server_name  www.mydomain.com;
     rewrite ^ http://mydomain.com$request_uri? permanent; 
}

For a reverse redirect (from mydomain.com to www.mydomain.com), add the section:

server {
     listen  80;
     server_name mydomain.com;
.....
}

For a reverse redirect (from mydomain.com to www.mydomain.com), add the section:

server {
     listen  80;
     server_name  domain.com;
     rewrite ^ http://www.domain.com$request_uri? permanent; 
}

Add or modify the existing section with the master domain settings:

server {
     listen  80;
     server_name www.mydomain.com;
.....
}

Restart the Nginx Web server using the command:

systemctl restart nginx