scrapy发送post请求获取cookie

from scrapy.http import Request,FormRequest

　　def start_requests(self):
        return [Request('http://www.com/login.htm', meta={'cookiejar': 1}, callback=self.parse)]

    def parse(self, response):
        url = 'http://www.com/login.htm'
        data = {
           #这里放data数据
        }
        yield  FormRequest.from_response(response,
                                          url=url,  # 真实post地址
                                          meta={'cookiejar': response.meta['cookiejar']},
                                          formdata=data,
                                          callback=self.next
                                          )

    def next(self,response):
        cookie = response.request.headers.getlist('Cookie')[0].decode()
        self.cookie = dict([l.split("=", 1) for l in cookie.split("; ")])
        url = "http://www.com/index.htm"
        yield scrapy.Request(url=url,cookies=self.cookie,callback=self.get_parse,dont_filter=True)