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This website uses this feature where http://bonsaiframework.com will redirect to http://www.bonsaiframework.com

Enable Rewrite Module

With Ubuntu this is very easy,

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Will result in showing a list of modules that you can enable. You want to enable rewrite. If it is not there than it might already be enabled.

Verify Rewrite Module

It is actually somewhat difficult to verify that the module is loaded.

Apply Directives

# Enforce www in front of url.
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.bonsaiframework\.com$ [NC]
RewriteRule (.*) http://www.bonsaiframework.com$1 [R,L]

I usually place these rules right after my ServerAlias lines in my virtual host.

Debugging