Broken site rsi.ch

[vzsze]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.02.22
• 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 (issue is different from [srgssr] no longer supports rsi.ch videos #26713)

Verbose log

$ youtube-dl --verbose "https://tp.srgssr.ch/p/rsi/portal-detail?urn=urn:rsi:video:13847236&autoplay=true&hideendscreen=1"
[debug] System config: []
[debug] User config: ['-f', 'bestvideo+bestaudio/best', '-o', '%(title)s.%(ext)s', '--restrict-filenames']
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'https://tp.srgssr.ch/p/rsi/portal-detail?urn=urn:rsi:video:13847236&autoplay=true&hideendscreen=1']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.02.22
[debug] Python version 3.8.5 (CPython) - Linux-5.8.0-43-generic-x86_64-with-glibc2.29
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, rtmpdump 2.4
[debug] Proxy map: {}
[SRGSSR] 13847236: Downloading JSON metadata
ERROR: Unable to download JSON metadata: HTTP Error 404: Not Found (caused by <HTTPError 404: 'Not Found'>); 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 "/home/rk/bin/youtube-dl/youtube_dl/extractor/common.py", line 632, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/home/rk/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2275, 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)

Description

youtube-dl shows 404 error, while URL is loading in Firefox and Chrome.