# File lib/active_resource/http_mock.rb, line 175
    def initialize(body, message = 200, headers = {})
      @body, @message, @headers = body, message.to_s, headers
      @code = @message[0,3].to_i

      resp_cls = Net::HTTPResponse::CODE_TO_OBJ[@code.to_s]
      if resp_cls && !resp_cls.body_permitted?
        @body = nil
      end

      if @body.nil?
        self['Content-Length'] = "0"
      else
        self['Content-Length'] = body.size.to_s
      end
    end