oauth:flickr can't establish a secure connection to the server "localhost"

[loewez]

After I clicked the authorisation button on flickr, my browser was redirected to localhost and showed an error:

Safari can't open the page "https://localhost:6414/?oauth_token=...." because Safari can't establish a secure connection to the server "localhost".

Test on Mac 10.13 and 10.14 and Windows 10, browser Firefox/Safari.

mac:~ user$ gallery-dl -v
[gallery-dl][debug] Version 1.11.1
[gallery-dl][debug] Python 3.7.4 - Darwin-17.7.0-x86_64-i386-64bit
[gallery-dl][debug] requests 2.22.0 - urllib3 1.25.7

mac:~ user$ gallery-dl --verbose oauth:flickr
[gallery-dl][debug] Version 1.11.1
[gallery-dl][debug] Python 3.7.4 - Darwin-17.7.0-x86_64-i386-64bit
[gallery-dl][debug] requests 2.22.0 - urllib3 1.25.7
[gallery-dl][debug] Starting DownloadJob for 'oauth:flickr'
[gallery-dl][debug] Updating urllib3 ciphers
[oauth][debug] Using OAuthFlickr for 'oauth:flickr'
[urllib3.connectionpool][debug] Starting new HTTPS connection (1): www.flickr.com:443
[urllib3.connectionpool][debug] https://www.flickr.com:443 "GET /services/oauth/request_token?oauth_callback=http%3A%2F%2Flocalhost%3A6414%2F HTTP/1.1" 200 109
Waiting for response. (Cancel with Ctrl+c)
[oauth][error] An unexpected error occurred: UnicodeDecodeError - 'utf-8' codec can't decode byte 0xe1 in position 4: invalid continuation byte. Please run gallery-dl again with the --verbose flag, copy its output and report this issue on https://github.com/mikf/gallery-dl/issues .
[oauth][debug] 
Traceback (most recent call last):
  File "/Users/user/.pyenv/versions/3.7.4/lib/python3.7/site-packages/gallery_dl/job.py", line 48, in run
    for msg in self.extractor:
  File "/Users/user/.pyenv/versions/3.7.4/lib/python3.7/site-packages/gallery_dl/extractor/oauth.py", line 199, in items
    "https://www.flickr.com/services/oauth/access_token",
  File "/Users/user/.pyenv/versions/3.7.4/lib/python3.7/site-packages/gallery_dl/extractor/oauth.py", line 83, in _oauth1_authorization_flow
    data = self.open(authorize_url, params)
  File "/Users/user/.pyenv/versions/3.7.4/lib/python3.7/site-packages/gallery_dl/extractor/oauth.py", line 69, in open
    return self.recv()
  File "/Users/user/.pyenv/versions/3.7.4/lib/python3.7/site-packages/gallery_dl/extractor/oauth.py", line 52, in recv
    data = self.client.recv(1024).decode()
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe1 in position 4: invalid continuation byte