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.htaccessmod-rewrite

.htaccess - how to force "www." in a generic way?

This will change domain.example to www.domain.example:

# Force the "www."
RewriteCond %{HTTP_HOST} !^www\.domain\.example$ [NC]
RewriteRule ^(.*)$ `http://www.domain.example/$1` [R=301,L]

How do I replace the "domain" part so that this works on any domain?

Solution

  • I would use this rule:

    RewriteEngine On
RewriteCond %{HTTP_HOST} !=""
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteCond %{HTTPS}s ^on(s)|
RewriteRule ^ http%1://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

    The first condition checks whether the Host value is not empty (in case of HTTP/1.0); the second checks whether the the Host value does not begin with www.; the third checks for HTTPS (%{HTTPS} is either on or off, so %{HTTPS}s is either ons or offs and in case of ons the s is matched). The substitution part of RewriteRule then just merges the information parts to a full URL.