如何使用请求模块从Web下载大数据文件？

Question

我正在使用python从网页下载文件，提交请求后，得到的标题如下：

r.headers=
{'Content-Disposition': 'attachment; filename="report20160619-013623.csv";',
 'Content-Transfer-Encoding': 'binary', 'Expires': '0',
'Keep-Alive': 'timeout=5, max=100', 'Server': 'Apache',
'Transfer-Encoding': 'chunked', 'Connection': 'Keep-Alive', 'Pragma': 'public',
'Cache-Control': 'must-revalidate, post-check=0, pre-check=0, private',
'Date': 'Sun, 19 Jun 2016 06:35:18 GMT', 'X-Frame-Options': 'SAMEORIGIN',
'Content-Type': 'application/octet-stream'}

我可以直接从大约50 MB的网页上下载文件，但是当我使用python request这样做时，它不起作用。 它返回：

r = sss.get(url, stream=True, headers=my_headers)

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests-2.8.1-py2.7.egg/requests/sessions.py", line 480, in get
    return self.request('GET', url, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests-2.8.1-py2.7.egg/requests/sessions.py", line 468, in request
    resp = self.send(prep, **send_kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests-2.8.1-py2.7.egg/requests/sessions.py", line 576, in send
    r = adapter.send(request, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/requests-2.8.1-py2.7.egg/requests/adapters.py", line 426, in send
    raise ConnectionError(err, request=request)
requests.exceptions.ConnectionError: ('Connection aborted.', BadStatusLine("''",))

这是我的URL： https : //aosreports2.corp.XXX.com/DOSSIER/?period=Date+Range&report_period=Current&start_date=2016-02-28&end_date=2016-03-15&data=bookings&low_val=&high_val=&search_var=none&search_vals=&run =下载＆m％5B％5D =总值+ USD +价值＆m％5B％5D =附加+ BTB + USD＆m％5B％5D =净值+单位＆r％5B％5D = Channel＆r％5B％5D = Region＆r％5B％5D = Country + GLOBALLOBS＆r ％5B％5D =订单+方法＆r％5B％5D =取消+原因＆r％5B％5D =取消+原因+类型＆r％5B％5D =产品+ LOB＆r％5B％5D =产品+子+家族＆r％5B％5D =产品+ Class＆f％5B％5D =销售+区+类别＆f％5B％5D = Channel＆f％5B％5D =财务+ Region＆f％5B％5D = Order + Product + Type＆salesDistCat％5B％5D = Sales＆chnl％5B％5D = ONL＆finRgn％5 ％5D = Greater + China＆ordProdType％5B％5D = STANDARD + ORDER＆radio％5B％5D = a_v＆altTax％5B％5D = a_v＆bpItem％5B％5D = a_v＆bpSubItem％5B％5D = a_v＆cpnId％5B％5D = a_v＆createTooln ％5B％5D = a_v＆crosBrdr％5B％5D = a_v＆csfID％5B％5D = a_v＆custGrp％5B％5D = a_v＆dsCt％5B％5D = a_v＆emeaShip1％5B％5D = a_v＆finInd％5B％5D = C ％5D = a_v＆multiCrdInd％5B％5D = a_v＆iCustNt％5B％5D = a_v＆busAdd ％5B％5D = a_v＆busAddItm％5B％5D = a_v＆iphLk％5B％5D = a_v＆itmShpcnd％5B％5D = a_v＆prtlDel％5B％5D = a_v＆oneClick％5B％5D = a_v＆payId％5B％5D = a_d ％5D = a_v＆qotInd％5B％5D = a_v＆Requote_Ind％5B％5D = a_v＆refurbInd％5B％5D = a_v＆replOrder％5B％5D = a_v＆retailStrId％5B％5D = a_v＆runRate％5B％5D = A％5％= D％ = a_v＆shipCondCd％5B％5D = a_v＆sapNte％5B％5D = a_v＆tmsFlg％5B％5D = a_v＆shipFlg％5B％5D = a_v＆preFlg％5B％5D = a_v＆sigRsn％5B％5D = a_v＆T％B％5％=％ ％5B％5D = a_v＆soldCust％5B％5D = a_v＆sftID％5B％5D = a_v＆thdPtypic％5B％5D = a_v＆volOrdQty％5B％5D = a_v＆vatflg％5B％5D = a_v＆v＆multiAdd％5B％5％= D ％5D = a_v

所以我的问题是如何使用python请求下载大数据文件？