Repository: youtube-dl
Issue: Can't download video from https://www.chabad.org/library/article_cdo/aid/113425/jewish/What-Is-Kosher.htm
Labels: site-support-request

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## Checklist

<!--
Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2021.12.17. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that site you are requesting is not dedicated to copyright infringement, see https://yt-dl.org/copyright-infringement. youtube-dl does not support such sites. In order for site support request to be accepted all provided example URLs should not violate any copyrights.
- Search the bugtracker for similar site support requests: http://yt-dl.org/search-issues. DO NOT post duplicates.
- Finally, put x into all relevant boxes (like this [x])
-->

- [x] I'm reporting a new site support request
- [x] I've verified that I'm running youtube-dl version **2021.12.17**
- [x] I've checked that all provided URLs are alive and playable in a browser
- [x] I've checked that none of provided URLs violate any copyrights
- [x] I've searched the bugtracker for similar site support requests including closed ones


## Example URLs

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Provide all kinds of example URLs support for which should be included. Replace following example URLs by yours.
-->

- Single video: https://www.chabad.org/library/article_cdo/aid/113425/jewish/What-Is-Kosher.htm



## Description

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```shellsession
youtube-dl --verbose https://www.chabad.org/library/article_cdo/aid/113425/jewish/What-Is-Kosher.htm
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://www.chabad.org/library/article_cdo/aid/113425/jewish/What-Is-Kosher.htm']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.8.10 (CPython) - Linux-5.13.0-51-generic-x86_64-with-glibc2.29
[debug] exe versions: ffmpeg 4.2.7, ffprobe 4.2.7
[debug] Proxy map: {}
[generic] What-Is-Kosher: Requesting header
WARNING: Could not send HEAD request to https://www.chabad.org/library/article_cdo/aid/113425/jewish/What-Is-Kosher.htm: HTTP Error 503: Service Temporarily Unavailable
[generic] What-Is-Kosher: Downloading webpage
ERROR: Unable to download webpage: HTTP Error 503: Service Temporarily Unavailable (caused by <HTTPError 503: 'Service Temporarily 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 "/home/user/python/myenv/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 634, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/home/user/python/myenv/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 2288, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 531, in open
    response = meth(req, response)
  File "/usr/lib/python3.8/urllib/request.py", line 640, in http_response
    response = self.parent.error(
  File "/usr/lib/python3.8/urllib/request.py", line 569, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 502, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.8/urllib/request.py", line 649, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)
```