Repository: youtube-dl
Issue: The Highwire https://thehighwire.com - Site Support Request
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 Issues with outdated version will be REJECTED.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])
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- [ 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://thehighwire.com/videos/risky-business/
- Single video:  https://thehighwire.com/videos/episode-219-in-harms-way/
- Single video:  https://thehighwire.com/videos/live-from-event-2021-in-dallas-tx/
- Single video:  https://thehighwire.com/videos/concealing-casualties/
- Single video:  https://thehighwire.com/videos/the-definition-of-a-bio-weapon/


## Description

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The videos can be downloaded by youtube-dl if you discover their real URLs, for example: https://media.livecast365.com/highwire/thehighwire/content/1622927384709.mp4 

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://thehighwire.com/videos/live-from-event-2021-in-dallas-tx/']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.06.06
[debug] Python version 3.9.2 (CPython) - Linux-5.10.25-linuxkit-x86_64-with-glibc2.31
[debug] exe versions: ffmpeg 4.3.2-0, ffprobe 4.3.2-0, rtmpdump 2.4
[debug] Proxy map: {}
[generic] live-from-event-2021-in-dallas-tx: Requesting header
WARNING: Falling back on generic information extractor.
[generic] live-from-event-2021-in-dallas-tx: Downloading webpage
[generic] live-from-event-2021-in-dallas-tx: Extracting information
ERROR: Unsupported URL: https://thehighwire.com/videos/live-from-event-2021-in-dallas-tx/
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/generic.py", line 3520, in _real_extract
    raise UnsupportedError(url)
youtube_dl.utils.UnsupportedError: Unsupported URL: https://thehighwire.com/videos/live-from-event-2021-in-dallas-tx/