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get file size before downloading using HTTP header not matching with one retrieved from urlopen

why is the content-lenght different in case of using requests and urlopen(url).info()

>>> url = 'http://pymotw.com/2/urllib/index.html'

>>> requests.head(url).headers.get('content-length', None)
'8176'
>>> urllib.urlopen(url).info()['content-length']
'38227'
>>> len(requests.get(url).content)
38274

I was going to make a check for size of file in bytes to split the buffer to multiple threads based on Range in urllib2 but if I do not have the actual size of file in bytes it won't work..

only len(requests.get(url).content) gives 38274 which is closest but still not correct and moreover it is downloading the content which i didn't wanted.

like image 930
Ciasto piekarz Avatar asked Jul 05 '14 09:07

Ciasto piekarz


1 Answers

By default, requests will send 'Accept-Encoding': 'gzip' as part of the request headers, and the server will respond with the compressed content:

>>> r = requests.head('http://pymotw.com/2/urllib/index.html')
r>>> r.headers['content-encoding'], r.headers['content-length']
('gzip', '8201')

But, if you manually set the request headers, then you'll get the uncompressed content:

>>> r = requests.head('http://pymotw.com/2/urllib/index.html',headers={'Accept-Encoding': 'identity'})
>>> r.headers['content-length']
'38227'
like image 167
Burhan Khalid Avatar answered Sep 17 '22 15:09

Burhan Khalid