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Rack::LocaleSelector is designed to provided locale detection settings through the middleware stack with I18n.

The behaviour is quite similar to google's locale settings: It tries first to fetch locale value from URI, cookie, HTTP_LANGUAGE_HEADERS or fallback to I18n default's value.

Rack::LocaleSelector sets the I18n.locale to the matching value or redirects the user to the proper locale in URI, here is how redirection work:

http://example.com (with cookie set to :fr) => http://fr.example.com
http://example.com (with HTTP_ACCEPT_HEADERS set to :fr) => http://fr.example.com

tricky ones:
http://es.example.com (with cookie set to :fr) => http://es.example.com (sets a cookie to :es)

You can choose to not use locale as subdomain but as a value in URI (example.com/fr) by setting :use_subdomain to false

Usage:

script/plugin install git://github.com/jeremyvdw/rack-locale-selector.git 

# config/environments/development.rb
config.middleware.use "Rack::LocaleSelector"

Options:
 :use_subdomain
 :default_domain
 :white_list # Buggy
 :black_list # Buggy

Thanks to:

Rack::Bug
Rack::Cache
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