SSLError (SSLCertVerificationError) when using gdown from some machines

[khyox]

When using gdown to try to download a file with file id _gdrive_long_file_id_ being a real file id:

$ gdown --id _gdrive_long_file_id_ 

I get the next error when doing so from some servers (it works from other machines):

Traceback (most recent call last):
  File "/.../py3.8.2/bin/gdown", line 11, in <module>
    load_entry_point('gdown', 'console_scripts', 'gdown')()
  File "/.../gdown/gdown/cli.py", line 104, in main
    download(
  File "/.../gdown/gdown/download.py", line 115, in download
    res = sess.get(url, stream=True, verify=verify)
  File "/.../python3.8/site-packages/requests/sessions.py", line 546, in get
    return self.request('GET', url, **kwargs)
  File "/.../python3.8/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/.../python3.8/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/.../python3.8/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
requests.exceptions.SSLError: HTTPSConnectionPool(host='drive.google.com', port=443):
Max retries exceeded with url: /uc?id=_gdrive_long_file_id_ (Caused by 
SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED]
certificate verify failed: self signed certificate in certificate chain (_ssl.c:1108)')))

This seems a known problem (e.g., see this issue) with the verification by Requests of the server's TLS certificate. A solution to this issue is to provide the users of gdown with a way to control Requests' verify parameter (it defaults to True, but see details in the API docs). I will link a PR for this solution to be considered and merged. Thanks.

[khyox]

With the changes in the PR, now:

$ gdown --id _gdrive_long_file_id_ --no-verify

is finally working (with some previous relevant warnings by InsecureRequestWarning):

  warnings.warn(
/.../python3.8/site-packages/urllib3/connectionpool.py:997: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
Downloading...
From: https://drive.google.com/uc?id=_gdrive_long_file_id_
To: /.../_gdrive_long_file_
673MB [27:38, 406kB/s]