Redirect without www on Nginx and Engine Yard

.htaccess

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

MyApp.rewrites

# Custom server level rewrites go here.
# This means that you can also enter custom rewrite locations here.

if ($host ~* www\.(.*)) {
  set $host_without_www $1;
  rewrite ^(.*)$ http://$host_without_www$1 permanent;
}