unable to download from youku.com. it returns "unauthorized client, 201"

[esojourn]

Please follow the guide below

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.10.05. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• [x ] I've verified and I assure that I'm running youtube-dl 2018.10.05

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• [ x] Searched the bugtracker for similar issues including closed ones
• [x ] Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• [ X] 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

I tried to download a video from youku.com.
it returns "unauthorized client, 201" error.

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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 ```):

youtube-dl https://v.youku.com/v_show/id_XMzcxMzIzMzk4OA==.html -v
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'https://v.youku.com/v_show/id_XMzcxMzIzMzk4OA==.html', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.10.05
[debug] Python version 2.7.5 (CPython) - Linux-3.10.0-862.3.3.el7.x86_64-x86_64-with-centos-7.5.1804-Core
[debug] exe versions: ffmpeg 2.8.15, ffprobe 2.8.15
[debug] Proxy map: {}
[youku] XMzcxMzIzMzk4OA: Retrieving cna info
[youku] XMzcxMzIzMzk4OA: Downloading JSON metadata
**ERROR: Youku server reported error -6004: 客户端无权播放,201; 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.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 507, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youku.py", line 189, in _real_extract
    raise ExtractorError(msg)
ExtractorError: Youku server reported error -6004: \u5ba2\u6237\u7aef\u65e0\u6743\u64ad\u653e,201; 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.

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