http error on udemy.com

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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 2017.12.28. 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 Issues with outdated version will be rejected.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 2017.12.28

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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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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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:

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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-o', u'%(autonumber)02d - %(title)s.%(ext)s', u'--username', u'PRIVATE', u'--password', u'PRIVATE', u'https://www.udemy.com/understand-nodejs/learn/v4/content', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.11.15
[debug] Python version 2.7.14 - Linux-4.13.0-21-generic-x86_64-with-Ubuntu-17.10-artful
[debug] exe versions: ffmpeg 3.3.4-2, ffprobe 3.3.4-2, rtmpdump 2.4
[debug] Proxy map: {'ftp': 'http://localhost:3128', 'http': 'http://localhost:3128', 'https': 'http://localhost:3128', 'no': 'localhost,127.0.0.0/8,::1'}
[udemy:course] Downloading login popup
[udemy:course] Logging in
[udemy:course] understand-nodejs: Downloading webpage
[udemy:course] 461160: Downloading course curriculum
[download] Downloading playlist: Learn and Understand NodeJS
[udemy:course] playlist Learn and Understand NodeJS: Collected 93 video ids (downloading 93 of them)
[download] Downloading video 1 of 93
[udemy] Downloading login popup
[udemy] 3452978: Downloading webpage
[udemy] 3452978: Downloading lecture JSON
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://udemy-assets-on-demand2.udemy.com/2015-09-10_08-42-08-1c322a0f2e167d10c287e82bce5e8f0c/WebHD_720p.mp4?nva=20171230024053&token=00199bda6111bedea2d07'
[download] 01 - Introduction and the Goal of this Course.mp4 has already been downloaded
[download] 100% of 15.94MiB
[download] Downloading video 2 of 93
[udemy] 3453072: Downloading webpage
[udemy] 3453072: Downloading lecture JSON
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://udemy-assets-on-demand.udemy.com/2015-08-16_17-33-34-77a6c2d779cd770cea82270299bc9cbe/WebHD_720p.mp4?nva=20171230024056&token=0bfffef1c0983341613a0'
[download] 02 - Big Words and NodeJS.mp4 has already been downloaded
[download] 100% of 10.92MiB
[download] Downloading video 3 of 93
[udemy] 3453082: Downloading webpage
[udemy] 3453082: Downloading lecture JSON
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on u'https://udemy-assets-on-demand.udemy.com/2015-08-30_21-26-23-6bb3efcf2064c253e6cea8ac7249fd62/WebHD_720p.mp4?nva=20171230024059&token=0bb122e511f37afcc760c'
[download] 03 - Conceptual Aside - The Command Line Interface.mp4 has already been downloaded
[download] 100% of 22.17MiB
[download] Downloading video 4 of 93
[udemy] 3453110: Downloading webpage
[udemy] 3453110: Downloading lecture JSON
ERROR: Unable to download JSON metadata: HTTP Error 404: NOT FOUND (caused by HTTPError()); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
  File "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 506, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 2196, 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 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)

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• 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

Note that youtube-dl does not support sites dedicated to copyright infringement. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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Description of your issue, suggested solution and other information

I am trying to download udemy courses, as usual, behind a NTLM proxy using cntlm on my local machine, but I am getting errors different http requests every time I run it to resume the download.