Can't download password protected Vimeo video when using www.vimeo.com url

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--video-password', u'PRIVATE', u'http://www.vimeo.com/249108620', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.28
[debug] Python version 2.7.13 - Linux-4.9.0-3-amd64-x86_64-with-debian-9.1
[debug] exe versions: avconv 3.2.7-1, avprobe 3.2.7-1, ffmpeg 3.2.7-1, ffprobe 3.2.7-1, rtmpdump 2.4
[debug] Proxy map: {}
[vimeo] 249108620: Downloading webpage
[vimeo] 249108620: Extracting information
[vimeo] 249108620: Verifying the password
[vimeo] 249108620: Downloading webpage
[vimeo] 249108620: Extracting information
ERROR: video password verification failed!; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/vimeo.py", line 535, in _real_extract
    flags=re.DOTALL)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 794, in _search_regex
    raise RegexNotFoundError('Unable to extract %s' % _name)
RegexNotFoundError: Unable to extract info section; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 784, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 438, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/vimeo.py", line 546, in _real_extract
    smuggle_url(url, {'_video_password_verified': 'verified'}))
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/extractor/vimeo.py", line 543, in _real_extract
    raise ExtractorError('video password verification failed!')
ExtractorError: video password verification failed!; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

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Description of your issue, suggested solution and other information

When trying to download a password protected Vimeo video using www.vimeo.com as a domain (either http or https) the procedure fails with "video password verification failed!", the download works when using vimeo.com as domain (either http or https).

Created a test video:
URL: https://www.vimeo.com/249108620
Password: test1234

Suggested solution: I've not had the opportunity to delve into the bug further to investigate. When opening the video through a browser, one gets redirected to https://vimeo.com from any other url base, so it's possible there's a redirect yt-dl is ignoring. Another (extremely dirty) solution would be automatically "scrubbing" www.vimeo.com to https://vimeo.com on the handler.