# Websites should have a canonical address. This address shouldn’t begin with “www” because <\/span>\n# it’s unnecessary and wasteful. See http://no-www.org/ for details. This middleware catches <\/span>\n# requests that begin with “www” and redirects them to the more reasonable non-www address.<\/span>\n\n# Rails Usage<\/span>\n\n# Put this file in lib/, and then add the following to config/environment.rb:<\/span>\n\n# Rails::Initializer.run do |config|<\/span>\n#   config.middleware.use “NoWWW” if RAILS_ENV == ‘production’<\/span>\n# end<\/span>\n\nclass<\/span> NoWWW<\/span>\n \n  STARTS_WITH_WWW<\/span> =<\/span> /^www\\./i<\/span>\n  \n  def<\/span> initialize<\/span>(<\/span>app<\/span>)<\/span>\n    @app<\/span> =<\/span> app<\/span>\n  end<\/span>\n  \n  def<\/span> call<\/span>(<\/span>env<\/span>)<\/span>\n    if<\/span> env<\/span>[<\/span>'HTTP_HOST'<\/span>]<\/span> =~<\/span> STARTS_WITH_WWW<\/span>\n      [<\/span>301<\/span>,<\/span> {<\/span> 'Location'<\/span> =><\/span> Rack<\/span>::<\/span>Request<\/span>.<\/span>new<\/span>(<\/span>env<\/span>)<\/span>.<\/span>url<\/span>.<\/span>sub<\/span>(<\/span>/www\\./i<\/span>,<\/span> ''<\/span>)<\/span> },<\/span> [<\/span>'Redirecting...'<\/span>]]<\/span>\n    else<\/span>\n      @app<\/span>.<\/span>call<\/span>(<\/span>env<\/span>)<\/span>\n    end<\/span>\n  end<\/span>\n  \nend<\/span>\n<\/pre><\/div>\n