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How to resume a file download in Python 3?

+2 votes

I would like to download a file. If the connection is OK, I can download the file with:

import urllib.request
urllib.request.urlretrieve(remote_file, local_file)

Sometimes when I am connected on week wireless (not mine) network I get WinError 10054 exception (windows 7). When it happens, I would like to resume download instead of doing everything from very beginning.

How to do that? I read about Range header and chunks, but this server doesn't have any headers.
What options do I have with this particular file?

posted Jun 30, 2015 by Sheetal Chauhan

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1 Answer

0 votes

If the web server supports the range request then you can add the Range header to your request:

Range: bytes=StartPos-StopPos

You will receive the part between StartPos and StopPos. If dont know the StopPos just use:

Range: bytes=StartPos-

So your code would be:

def resume_download(fileurl, resume_byte_pos):
    resume_header = {'Range': 'bytes=%d-' % resume_byte_pos}
    return requests.get(fileurl, headers=resume_header, stream=True,  verify=False, allow_redirects=True)
answer Jul 1, 2015 by Amit Kumar Pandey
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