How do I redirect without www using Rails 3 / Rack?

Question

I understand there are a lot of questions that answer this. I\'m familiar with .htaccess and nginx.conf methods, but I do not have access to such t

Answer 1

If you want to redirect from the top-level domain (TLD) to the www subdomain, use this code:

constraints :subdomain => '' do
  match '(*any)' => redirect { |p, req| req.url.sub('//', '//www.') }
end

Note: This code the use of sub, not gsub, because sub replaces the first occurrence of the double-slashes where gsub would replace all double-slashes.