no-www rack middleware

no_www.rb

class NoWww

  def initialize(app)
    @app = app
  end

  def call(env)
    request = Rack::Request.new(env)
    if request.host.starts_with?("www.")
      [301, {"Location" => request.url.sub(/www./, "")}, self]
    else
      @app.call(env)
    end
  end

  def each(&block)
  end

end

production.rb

require "rack/ssl"
require "no_www"
config.middleware.insert_before ::Rack::SSL, ::NoWww