France.tv 503 error

[Quasar2308]

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.12.17
• 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', 'https://www.france.tv/enfants/trois-cinq-ans/pip-et-posy/saison-1/3226036-remets-toi-vite-pip.html']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.22610
[debug] exe versions: ffmpeg 2022-05-02-git-40f2ea971f-full_build-www.gyan.dev, ffprobe 2022-05-02-git-40f2ea971f-full_build-www.gyan.dev
[debug] Proxy map: {}
[FranceTVSite] 3226036-remets-toi-vite-pip: Downloading webpage
[FranceTV] 6ba01afc-5d67-42f5-9174-9e465f0fe849: Downloading video JSON
ERROR: Unable to download JSON metadata: HTTP Error 503: Service Unavailable (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type youtube-dl -U to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\extractor\common.py", line 634, in _request_webpage
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\YoutubeDL.py", line 2288, in urlopen
File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
File "C:\Python\Python34\lib\urllib\request.py", line 508, in error
File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
File "C:\Python\Python34\lib\urllib\request.py", line 588, in http_error_default

##Description

When attempting to download from france.tv, Youtube-DL is unable to download video JSON properly due to HTTP 503 error. This log is from a device that is able to access the video via the website.

[dirkf]

Duplicate of #29956.