ERROR: Unable to download webpage: HTTP Error 404

[Pkallesoe]

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• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.09.11. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2017.09.11

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the 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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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

[debug] System config: []                                                                                                                                                                                                         
[debug] User config: []
[debug] Custom config: []                                                                                                                                                                                                         
[debug] Command-line args: ['https://www.youtube.com/watch\\?v\\=RcNJA6V4tNY', '--verbose']                                                                                                                                       
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8                                                                                                                                                                  
[debug] youtube-dl version 2017.09.11
[debug] Python version 3.6.2 - Linux-4.12.12-1-ARCH-x86_64-with-arch                                                                                                                                                              
[debug] exe versions: ffmpeg 3.3.3, ffprobe 3.3.3, rtmpdump 2.4                                                                                                                                                                   
[debug] Proxy map: {}                                                                                                                                                                                                             
[generic] watch\?v\=RcNJA6V4tNY: Requesting header                                                                                                                                                                                
WARNING: Could not send HEAD request to https://www.youtube.com/watch\?v\=RcNJA6V4tNY: HTTP Error 404: Not Found                                                                                                                  
[generic] watch\?v\=RcNJA6V4tNY: Downloading webpage                                                                                                                                                                              
ERROR: Unable to download webpage: HTTP Error 404: Not Found (caused by <HTTPError 404: 'Not Found'>); 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 "./Youtube-dl/youtube_dl/extractor/common.py", line 503, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "./Youtube-dl/youtube_dl/YoutubeDL.py", line 2176, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 532, in open
    response = meth(req, response)
  File "/usr/lib/python3.6/urllib/request.py", line 642, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python3.6/urllib/request.py", line 570, in error
    return self._call_chain(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 650, in http_error_default
    raise HTTPError(req.full_url, code, msg, hdrs, fp)

[dstftw]

Superfluous escaping.