python - 使用scrapy爬取新浪微博，无法进入回调的parse_item函数，怎么回事呢？

为什么会无法进入parse_item函数呢，自己讲web.com的url全部换成了csdn之后就可以了，甚至用的还是weibo的cookie，自己怀疑是不是因为微博重定向的原因，代码如下：

import scrapy
import re 
from scrapy.selector import Selector
from scrapy.http import Request
from tutorial.items import DmozItem
from string import maketrans
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.contrib.linkextractors import LinkExtractor
def extractData(regex, content, index=1): 
    r = '0' 
    p = re.compile(regex) 
    m = p.search(content) 
    if m: 
        r = m.group(index) 
    return r 
class DmozSpider(CrawlSpider):
    name = "dmoz"
    allowed_domains = ["weibo.com"]
    download_delay = 2
    rules=[
        Rule(LinkExtractor(allow=('/')),callback='parse_item',follow=True)
        ]

    headers = {
        "Accept": "*/*",
        "Accept-Encoding": "gzip, deflate, sdch, br",
        "Accept-Language": "zh-CN,zh;q=0.8",
        "Connection": "keep-alive",
        # "Host": "login.sina.com.cn",
        "Referer": "http://weibo.com/",
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36"
    }
    cookies = {
        'ALF':'我的cookie',
        'Apache':'我的cookie',
        'SCF':'我的cookie',
        'SINAGLOBAL':'我的cookie',
        'SSOLoginState':'我的cookie',
        'SUB':'我的cookie',
        'SUBP':'我的cookie',
        'SUHB':'我的cookie',
        'TC-Page-G0':'我的cookie',
        'TC-Ugrow-G0':'我的cookie',
        'TC-V5-G0':'我的cookie',
        'ULV':'我的cookie',
        'UOR':'我的cookie',
        'WBStorage':'我的cookie',
        'YF-Page-G0':'我的cookie',
        'YF-Ugrow-G0':'我的cookie',
        'YF-V5-G0':'我的cookie',
        '_s_tentry':'-',
        'log_sid_t':'我的cookie',
        'un':'我的cookie',
    }
    def start_requests(self):
        return [Request("http://weibo.com/u/2010226570?refer_flag=1001030101_&is_all=1",cookies = self.cookies,headers=self.headers)]

    def parse_item(self, response):
        print "comehere!"
        regexID=r'class=\\"username\\">(.*)\<\\/h1>'
        content=response.body
        item=DmozItem()
        ID=extractData(regexID,content,1)
        item['ID']=ID
        print ID       
        yield item
  

同时控制台输出如下，自己初步怀疑是重定向的原因，那么怎么解决呢，怎么才可以进入parse_item函数呢？：