# File lib/rack/cors.rb, line 5
    def initialize(app, opts={}, &block)
      @app = app
      @logger = opts[:logger]
      @debug_mode = !!opts[:debug]

      if block_given?
        if block.arity == 1
          block.call(self)
        else
          instance_eval(&block)
        end
      end
    end