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I'm trying to save a dynamic pdf file generated from a web server using python's module urllib2. I use following code to get data from server and to write that data to a file in order to store the pdf in a local disk.: import urllib2 import cookielib theurl = 'https://myweb.com/?pdf&var1=1' cj = cookielib.CookieJar() opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj)) opener.addheaders.append(('Cookie', cookie)) request = urllib2.Request(theurl) print("... Sending HTTP GET to %s" % theurl) f = opener.open(request) data = f.read() f.close() opener.close() FILE = open('report.pdf', "w") FILE.write(data) FILE.close() This code runs well but the written pdf file is not well recognized by adobe reader. If I do the request manually using firefox, I have no problems to receive the file and I can visualize it withouut problems. Comparing the received http headers (firefox and urrlib) the only difference is a http header field called "Transfer-Encoding = chunked". This field is received in firefox but it seems that is not received when I do the urllib request. Any suggestion?

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