[naver.com] Format incorrectly identified as non-HTTP?

[Rudloff]

Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.01.14. 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 Issues with outdated version will be rejected.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 2017.01.14

Before submitting an issue make sure you have:

• At least skimmed through README and most notably 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:

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

$ youtube-dl --get-url http://tvcast.naver.com/v/1326531 -f best[protocol^=http] -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--get-url', u'http://tvcast.naver.com/v/1326531', u'-f', u'best[protocol^=http]', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.01.14
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.6
[debug] exe versions: avconv 11.8-6, avprobe 11.8-6, rtmpdump 2.4
[debug] Proxy map: {}
ERROR: requested format not available
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 705, in extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 751, in process_ie_result
    return self.process_video_result(ie_result, download=download)
  File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1427, in process_video_result
    expected=True)
ExtractorError: requested format not available

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Description of your issue, suggested solution and other information

Using -f best[protocol^=http] with the naver extractor does not work because for some reason the protocol of the formats is null (although they use regular HTTP URLs).