Twitch v3 API deprecated (HTTP 410 Gone)

[duizu]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.05.29
• 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.twitch.tv/videos/639326061
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://www.twitch.tv/videos/639326061']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.05.29
[debug] Python version 2.7.16 (CPython) - Linux-5.4.0-4-amd64-x86_64-with-debian-10.3
[debug] exe versions: ffmpeg 4.1.4-1, ffprobe 4.1.4-1
[debug] Proxy map: {}
[twitch:vod] 639326061: Downloading vod info JSON
ERROR: Unable to download JSON metadata: HTTP Error 410: Gone (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 "./youtube-dl/youtube_dl/extractor/common.py", line 627, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "./youtube-dl/youtube_dl/YoutubeDL.py", line 2238, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python2.7/urllib2.py", line 435, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 548, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 473, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 556, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)

Description

Every twitch.tv URL I've tried (vod, stream, and channel) results in this, HTTP 410 Gone. Investigating further, it seems twitch has dropped support for the API youtube-dl uses:

$ curl https://api.twitch.tv/kraken/v639326061?client_id=kimne78kx3ncx6brgo4mv6wki5h1ko
{"error":"Gone","status":410,"message":"War. War never changes... but APIs do. See https://dev.twitch.tv/docs"}

There's a new message every time, e.g.

• War. War never changes... but APIs do. See https://dev.twitch.tv/docs
• The API version you are looking for is in another castle. See https://dev.twitch.tv/docs
• It's time to kick ass and serve v3... and I'm all outta v3. See https://dev.twitch.tv/docs
• v3 is a lie but v5 is still alive. See https://dev.twitch.tv/docs