Redirect old url to a new url

RewriteEngine On
RewriteRule /oldurl  /newurl [R=301,L]

Canonical domain rewriting

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

See also

• Apache module mod_rewrite documentation
• Permanent redirect with nginx
• Permanent redirect with lighttpd