Discovery Go URL falling back on generic information extractor

[cas4]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2019.07.16
• 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.exe --verbose --hls-prefer-native --ap-mso Comcast_SSO --ap-username PRIVATE --ap-password PRIVATE https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', '--hls-prefer-native', '--ap-mso', 'Comcast_SSO', '--ap-username', 'PRIVATE', '--ap-password', 'PRIVATE', 'https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2019.07.16
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17134
[debug] exe versions: ffmpeg N-61620-ge555e1b, ffprobe git-2017-12-23-d02289c
[debug] Proxy map: {}
[generic] buckers-and-brawlers-2: Requesting header
WARNING: Falling back on generic information extractor.
[generic] buckers-and-brawlers-2: Downloading webpage
[generic] buckers-and-brawlers-2: Extracting information
ERROR: Unsupported URL: https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\extractor\generic.py", line 3333, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2

youtube-dl.exe --verbose --hls-prefer-native --cookies ./cookies_discovery.txt https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', '--hls-prefer-native', '--cookies', './cookies_discovery.txt', 'https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2019.07.16
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.17134
[debug] exe versions: ffmpeg N-61620-ge555e1b, ffprobe git-2017-12-23-d02289c
[debug] Proxy map: {}
[generic] buckers-and-brawlers-2: Requesting header
WARNING: Falling back on generic information extractor.
[generic] buckers-and-brawlers-2: Downloading webpage
[generic] buckers-and-brawlers-2: Extracting information
ERROR: Unsupported URL: https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\YoutubeDL.py", line 796, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\extractor\common.py", line 530, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpaxmfe_l6\build\youtube_dl\extractor\generic.py", line 3333, in _real_extract
youtube_dl.utils.UnsupportedError: Unsupported URL: https://go.discovery.com/tv-shows/battlebots/full-episodes/buckers-and-brawlers-2

Description

When passing a "go.discovery.com" URL, it falls back to the generic information extractor after requesting the header. I opened ticket #21843 and it was closed with "You must provide account credentials.", however as I demonstrated above, I tried with both the cookies file (worked up until ~7/7/2019) and I also tried using the --ap-mso switch to pass in my credentials. Both failed with the same error message. This does not appear to be a permissions issue, but something appears to have changed in the discovery.com website.

[cas4]

Can I please get an explanation as to why these cases are being closed? #21843 was closed with the comment account credentials needed and they were through the cookie file. I opened this case showing the output using the ap-mso switch the show it wasn't an account login problem and pointing out that the discovery exctracter was not used for a discovery url. Any insight into this problem would be appreciated.

[Diegus83]

The problem is that Discovery changed the URLs to "go.discovery.com" and those are not picked up by the extractor. It has been fixed by this commit
3b446ab

You can run the current code in developer mode or wait for the next release which will probably include the fix.