# File lib/rack/response.rb, line 70
    def finish(&block)
      @block = block

      if [204, 205, 304].include?(status.to_i)
        header.delete "Content-Type"
        header.delete "Content-Length"
        close
        [status.to_i, header, []]
      else
        [status.to_i, header, BodyProxy.new(self){}]
      end
    end