Repository: youtube-dl
Issue: UnsupportedError: Unsupported URL: https://app.konf.co/event/nV9LOoiQ/session/4675?wvideo=4nh2gmql2j
Labels: site-support-request

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## Checklist

<!--
Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2021.06.06. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that site you are requesting is not dedicated to copyright infringement, see https://yt-dl.org/copyright-infringement. youtube-dl does not support such sites. In order for site support request to be accepted all provided example URLs should not violate any copyrights.
- Search the bugtracker for similar site support requests: http://yt-dl.org/search-issues. DO NOT post duplicates.
- Finally, put x into all relevant boxes (like this [x])
-->

- [x ] I'm reporting a new site support request
- [x ] I've verified that I'm running youtube-dl version **2021.06.06**
- [x ] I've checked that all provided URLs are alive and playable in a browser
- [x ] I've checked that none of provided URLs violate any copyrights
- [x ] I've searched the bugtracker for similar site support requests including closed ones


## Example URLs

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Provide all kinds of example URLs support for which should be included. Replace following example URLs by yours.
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- Single video: https://www.youtube.com/watch?v=BaW_jenozKc
- Single video: https://youtu.be/BaW_jenozKc
- Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc


## Description

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WRITE DESCRIPTION HERE
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Verbose output is here: (version is 2021.06.06) - thanks

chris@aranda:/media/chris/One Touch
$ youtube-dl -v https://app.konf.co/event/nV9LOoiQ/session/4675?wvideo=4nh2gmql2j
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'https://app.konf.co/event/nV9LOoiQ/session/4675?wvideo=4nh2gmql2j']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2021.06.06
[debug] Python version 2.7.13 (CPython) - Linux-4.19.0-5-amd64-x86_64-with-MX-18.3-Continuum
[debug] exe versions: ffmpeg 3.3.4-1mx17, ffprobe 3.3.4-1mx17, rtmpdump 2.4
[debug] Proxy map: {}
[generic] 4675?wvideo=4nh2gmql2j: Requesting header
WARNING: Falling back on generic information extractor.
[generic] 4675?wvideo=4nh2gmql2j: Downloading webpage
[generic] 4675?wvideo=4nh2gmql2j: Extracting information
ERROR: Unsupported URL: https://app.konf.co/event/nV9LOoiQ/session/4675?wvideo=4nh2gmql2j
Traceback (most recent call last):
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/extractor/generic.py", line 2503, in _real_extract
    doc = compat_etree_fromstring(webpage.encode('utf-8'))
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/compat.py", line 2571, in compat_etree_fromstring
    doc = _XML(text, parser=etree.XMLParser(target=_TreeBuilder(element_factory=_element_factory)))
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/compat.py", line 2560, in _XML
    parser.feed(text)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1653, in feed
    self._raiseerror(v)
  File "/usr/lib/python2.7/xml/etree/ElementTree.py", line 1517, in _raiseerror
    raise err
ParseError: syntax error: line 1, column 0
Traceback (most recent call last):
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/home/chris/.local/lib/python2.7/site-packages/youtube_dl/extractor/generic.py", line 3520, in _real_extract
    raise UnsupportedError(url)
UnsupportedError: Unsupported URL: https://app.konf.co/event/nV9LOoiQ/session/4675?wvideo=4nh2gmql2j

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