scrapy 抓取中报 throwExceptionIntoGenerator

Question

抓取一个速卖通单个商品的 卢布和美元价格
循环进行抓取 当抓取到第7次的时候报了一个这样的错误

2016-12-01 16:52:08 [scrapy] ERROR: Error downloading <GET https://ru.aliexpress.com/category/202005148/dresses.html>
Traceback (most recent call last):
  File "/usr/local/lib/python3.4/dist-packages/twisted/internet/defer.py", line 1297, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/local/lib/python3.4/dist-packages/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/local/lib/python3.4/dist-packages/scrapy/core/downloader/middleware.py", line 43, in process_request
    defer.returnValue((yield download_func(request=request,spider=spider)))
twisted.web._newclient.ResponseFailed: [<twisted.python.failure.Failure twisted.internet.error.ConnectionDone: Connection was closed cleanly.>, <twisted.python.failure.Failure twisted.web.http._DataLoss: Chunked decoder in 'CHUNK_LENGTH' state, still expecting more data to get to 'FINISHED' state.>]