Error : Unable to download webpage: '' (caused by BadStatusLine("''",));

[Sandlayth]

[kalix@arch-desktop dl]$ youtube-dl --proxy http://www.youtubeunblocker.org https://www.youtube.com/watch?v=4cby_RCIcIU --verbose | xclip -i
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['--proxy', 'http://www.mainprox.com', '--proxy', 'http://www.youtubeunblocker.org', 'https://www.youtube.com/watch?v=4cby_RCIcIU', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.04.26
[debug] Python version 3.4.3 - Linux-3.19.3-3-ARCH-i686-with-arch
[debug] exe versions: ffmpeg 2.6.2, ffprobe 2.6.2, rtmpdump 2.4
[debug] Proxy map: {'https': 'http://www.youtubeunblocker.org', 'http': 'http://www.youtubeunblocker.org'}
ERROR: Unable to download webpage: '' (caused by BadStatusLine("''",)); 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/python3.4/site-packages/youtube_dl/extractor/common.py", line 315, in _request_webpage
return self._downloader.urlopen(url_or_request)
File "/usr/lib/python3.4/site-packages/youtube_dl/YoutubeDL.py", line 1701, in urlopen
return self._opener.open(req, timeout=self._socket_timeout)
File "/usr/lib/python3.4/urllib/request.py", line 463, in open
response = self._open(req, data)
File "/usr/lib/python3.4/urllib/request.py", line 481, in _open
'_open', req)
File "/usr/lib/python3.4/urllib/request.py", line 441, in _call_chain
result = func(_args)
File "/usr/lib/python3.4/site-packages/youtube_dl/utils.py", line 719, in https_open
req, *_kwargs)
File "/usr/lib/python3.4/urllib/request.py", line 1182, in do_open
h.request(req.get_method(), req.selector, req.data, headers)
File "/usr/lib/python3.4/http/client.py", line 1088, in request
self._send_request(method, url, body, headers)
File "/usr/lib/python3.4/http/client.py", line 1126, in _send_request
self.endheaders(body)
File "/usr/lib/python3.4/http/client.py", line 1084, in endheaders
self._send_output(message_body)
File "/usr/lib/python3.4/http/client.py", line 922, in _send_output
self.send(msg)
File "/usr/lib/python3.4/http/client.py", line 857, in send
self.connect()
File "/usr/lib/python3.4/http/client.py", line 1223, in connect
super().connect()
File "/usr/lib/python3.4/http/client.py", line 837, in connect
self._tunnel()
File "/usr/lib/python3.4/http/client.py", line 815, in _tunnel
(version, code, message) = response._read_status()
File "/usr/lib/python3.4/http/client.py", line 321, in _read_status
raise BadStatusLine(line)

[yan12125]

www.youtubeunblocker.org is not a standard proxy server. Technically, standard proxy servers should implement the CONNECT method, while www.youtubeunblocker.org not.