我正在使用scrapy下载页面列表，此时此刻我没有提取任何数据，所以我只在csv文件中保存response.body。
我也没有爬行，所以开始网址是我需要获得的唯一网址，我有400个网址列表
start_urls =['url_1','url_2,'url_3',---,'url_400']
但是我只获得了大约170的来源，没有任何关于什么的信息;其余部分正在发生。
这是我最后得到的日志
2016-05-16 04:30:25 [scrapy] INFO: Closing spider (finished)
2016-05-16 04:30:25 [scrapy] INFO: Stored csv feed (166 items) in: pages.csv
2016-05-16 04:30:25 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 11,
'downloader/exception_type_count/twisted.internet.error.TimeoutError': 6,
'downloader/exception_type_count/twisted.web._newclient.ResponseFailed': 5,
'downloader/request_bytes': 95268,
'downloader/request_count': 180,
'downloader/request_method_count/GET': 180,
'downloader/response_bytes': 3931169,
'downloader/response_count': 169,
'downloader/response_status_count/200': 166,
'downloader/response_status_count/404': 3,
'finish_reason': 'finished',
'finish_time': datetime.datetime(2016, 5, 16, 9, 0, 25, 461208),
'item_scraped_count': 166,
'log_count/DEBUG': 350,
'log_count/INFO': 17,
'response_received_count': 169,
'scheduler/dequeued': 180,
'scheduler/dequeued/memory': 180,
'scheduler/enqueued': 180,
'scheduler/enqueued/memory': 180,
'start_time': datetime.datetime(2016, 5, 16, 8, 50, 34, 443699)}
2016-05-16 04:30:25 [scrapy] INFO: Spider closed (finished)