For whatever reason I can't seem to get this right, I've looked at many examples on here and apache's website. I'm trying to force www.domain.com instead of domain.com on EITHER http or https but I am not trying to force https over http.

the following code seems to work for all https connections but http will not redirect to www.

RewriteEngine On
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} !^www\.domain\.com$ [NC]
RewriteRule ^ https://www.domain.com%{REQUEST_URI} [R=301]

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteCond %{HTTP_HOST} !^www\.domain\.com$ [NC]
RewriteRule ^ http://www.domain.com%{REQUEST_URI} [R=301]