用 pyspider 抓取苹果团的主题标题乱码怎么解决？

class Handler(BaseHandler):

    '''
    this is a sample handler
    '''
    crawl_config = {
        "headers": {
            "User-Agent": "BaiDuSpider",
        }
    }

    @every(minutes=24 * 60, seconds=0)
    def on_start(self):
        self.crawl('http://www.appletuan.com/', callback=self.index_page)

    @config(age=10 * 24 * 60 * 60)
    def index_page(self, response):
        for each in response.doc('.topic_title a[href^="http://"]').items():
            self.crawl(each.attr.href, callback=self.detail_page)

    def detail_page(self, response):
        return {
            "url": response.url,
            "title": response.doc('.header h1').text(),
        }