Unable to download webpage: HTTP Error 503: Service Unavailable

[hungnguyen95]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.08.02
• 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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '-f', 'best[format_id^=hls]', 'https://www.dailymotion.com/video/x4uoq9y', '-o', 'download.mp4', '--hls-prefer-native']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.08.02
[debug] Python version 3.6.8 (CPython) - Linux-4.14.79+-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6
[debug] Proxy map: {}
[dailymotion] x4uoq9y: Downloading webpage
ERROR: Unable to download webpage: HTTP Error 503: Service Unavailable (caused by <HTTPError 503: 'Service Unavailable'>); 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.
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/extractor/common.py", line 627, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/lib/python3.6/dist-packages/youtube_dl/YoutubeDL.py", line 2227, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)

Description

I've run this command since last week and it worked well. I download video from dailymotion daily.
But today I have got this error.
Help me solve this problem.
Thanks!

[dstftw]

> py -2.7 .\youtube_dl\__main__.py https://www.dailymotion.com/video/x4uoq9y
[dailymotion] x4uoq9y: Downloading webpage
[dailymotion] x4uoq9y: Downloading metadata JSON
[dailymotion] x4uoq9y: Downloading m3u8 information
[dailymotion] x4uoq9y: Downloading m3u8 information
[dailymotion] x4uoq9y: Downloading m3u8 information
[dailymotion] x4uoq9y: Downloading m3u8 information
[dailymotion] x4uoq9y: Downloading m3u8 information
[download] Destination: Wizards of Waverly Place - S 1 E 3 - I Almost Drowned In a Chocolate Fountain!-x4uoq9y.mp4
[download]   0.0% of 130.12MiB at 55.90KiB/s ETA 39:42
ERROR: Interrupted by user