[BUG] Unable to download webpage: HTTP Error 429: Too Many Requests

[CyberPoison]

Checklist

• [ X ] I'm reporting a broken site support issue
• [ X ] I've verified that I'm running youtube-dl version 2020.05.08
• [ X ] I've checked that all provided URLs are alive and playable in a browser
• [ X ] I've checked that all URLs and arguments with special characters are properly quoted or escaped
• [ X ] I've searched the bugtracker for similar bug reports including closed ones
• [ X ] I've read bugs section in FAQ

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--prefer-ffmpeg', u'-f', u'best', u'-ciw', u'--write-info-json', u'--write-thumbnail', u'--add-metadata', u'--ignore-errors', u'-o', u'./files/%(uploader)s/%(title)s - %(id)s/%(title)s - %(id)s.%(ext)s', u'--verbose', u'https://www.youtube.com/channel/UCU0FhLr6fr7U9GOn6OiQHpQ']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.05.08
[debug] Python version 2.7.17 (CPython) - Linux-4.15.0-91-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: ffmpeg 3.4.6, ffprobe 3.4.6, phantomjs ., rtmpdump 2.4
[debug] Proxy map: {}
[youtube:channel] UCU0FhLr6fr7U9GOn6OiQHpQ: Downloading channel page
WARNING: Unable to download webpage: HTTP Error 429: Too Many Requests
[youtube:channel] UCU0FhLr6fr7U9GOn6OiQHpQ: Downloading page #1
ERROR: Unable to download webpage: HTTP Error 429: Too Many Requests (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 "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 627, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/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 467, in error
    result = 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 654, in http_error_302
    return self.parent.open(new, timeout=req.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

I have tried to dl a full youtube channel btw looks like this caused some issues on my side, it said than the http have to many request, btw there is a way to dl the videos of a full youtube channel, this is the command i have used

youtube-dl --prefer-ffmpeg -f best -ciw --write-info-json --write-thumbnail --add-metadata --ignore-errors -o "./files/%(uploader)s/%(title)s - %(id)s/%(title)s - %(id)s.%(ext)s" -v https://www.youtube.com/channel/UCU0FhLr6fr7U9GOn6OiQHpQ