Regression in 2017.03.05: downloading Twitch VODs that require login

[stephenwade]

• I've verified and I assure that I'm running youtube-dl 2017.03.05

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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Description of your issue, suggested solution and other information

In version 2017.03.05, I can no longer download Twitch videos that are only available to subscribers. When I try, the program crashes after [twitch:vod] Logging in as (username):

  File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 535, in sanitize_url
AttributeError: 'NoneType' object has no attribute 'startswith'

This is a regression, not a change in Twitch's download page. I downloaded 2017.03.02 and verified that I can still download the same video with that version. Both verbose outputs are provided below.

I have an account that is subscribed to the channel required to view the VOD I am testing with. I'm happy to give my credentials to someone over email, just not to post them publicly on Github. Email me at stephen@stephenwade.me.

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Verbose output (current version, failure)

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

stephen@stephen-retina:~$ youtube-dl -v --username (username) -f Source https://www.twitch.tv/videos/125983527
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'--username', u'PRIVATE', u'-f', u'Source', u'https://www.twitch.tv/videos/125983527']
Type account password and press [Return]:
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.03.05
[debug] Python version 2.7.13 - Darwin-16.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.4, ffprobe 3.2.4
[debug] Proxy map: {}
[twitch:vod] Downloading login page
[twitch:vod] Logging in as (username)
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 457, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 447, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1883, in download
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 761, in extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 426, in extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 384, in initialize
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 56, in _real_initialize
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 106, in _login
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/twitch.py", line 83, in login_step
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 650, in _download_json
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 618, in _download_webpage
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 525, in _download_webpage_handle
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 494, in _request_webpage
  File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 539, in sanitized_Request
  File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 535, in sanitize_url
AttributeError: 'NoneType' object has no attribute 'startswith'

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Verbose output (older version, success)

stephen@stephen-retina:~$ youtube-dl/youtube-dl -v --username (username) -f Source https://www.twitch.tv/videos/125983527
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'--username', u'PRIVATE', u'-f', u'Source', u'https://www.twitch.tv/videos/125983527']
Type account password and press [Return]:
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.03.02
[debug] Python version 2.7.13 - Darwin-16.5.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.4, ffprobe 3.2.4
[debug] Proxy map: {}
[twitch:vod] Downloading login page
[twitch:vod] Logging in as (username)
[twitch:vod] Downloading login redirect page
[twitch:vod] 125983527: Downloading vod info JSON
[twitch:vod] 125983527: Downloading vod access token
[twitch:vod] 125983527: Downloading m3u8 information
[debug] Invoking downloader on u'https://vod172-ttvnw.akamaized.net/v1/AUTH_system/vods_351a/geekandsundry_24677685584_611025851/chunked/index-dvr.m3u8'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 10544
[download] Destination: Critical Role Ep88 - Release the Kraken! #GNSLive #VoxMachina -v125983527.mp4
...(downloading)

[stephenwade]

I think this was caused by #11974, since it changes the Twitch login code.