4tube.com doesn't work anymore

[fturco]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.04.30
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

$ ./youtube-dl -v "https://www.4tube.com/videos/456604/wet-fuck-creamp"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.4tube.com/videos/456604/wet-fuck-creamp']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.04.30
[debug] Python version 3.7.3 (CPython) - Linux-5.0.9-gnu-i3-x86_64-Intel-R-_Core-TM-2_Duo_CPU_E8400_@_3.00GHz-with-gentoo-2.6
[debug] exe versions: ffmpeg 4.1.3, ffprobe 4.1.3
[debug] Proxy map: {}
[4tube] 456604: Downloading webpage
[4tube] 456604: Downloading JSON metadata
ERROR: Unable to download JSON metadata: <urlopen error [Errno -2] Name or service not known> (caused by URLError(gaierror(-2, 'Name or service not known')))
  File "./youtube-dl/youtube_dl/extractor/common.py", line 626, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 2227, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python3.7/urllib/request.py", line 525, in open
    response = self._open(req, data)
  File "/usr/lib/python3.7/urllib/request.py", line 543, in _open
    '_open', req)
  File "/usr/lib/python3.7/urllib/request.py", line 503, in _call_chain
    result = func(*args)
  File "./youtube-dl/youtube_dl/utils.py", line 1140, in https_open
    req, **kwargs)
  File "/usr/lib/python3.7/urllib/request.py", line 1319, in do_open
    raise URLError(err)