www_ditcher.rb

class WwwDitcher
  
  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.", "//")}, []]
    else
      @app.call(env)
    end
    
  end
  
  def each(&block)
  end
  
end