--proxy always raises error

[Khang-NT]

• I've verified and I assure that I'm running youtube-dl 2017.01.14

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• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

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• Bug report (encountered problems with youtube-dl)
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• Feature request (request for a new functionality)
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---

$ youtube-dl -v --proxy http://188.166.168.57:3128 FC1Y4Dg-T9o
[youtube] FC1Y4Dg-T9o: Downloading webpage
ERROR: Unable to download webpage: <urlopen error Tunnel connection failed: 400 Bad Request> (caused by URLError(OSError('Tunnel connection failed: 400 Bad Request',),))
Khangs-MacBook-Air:~ khangnt$ youtube-dl --proxy http://188.166.168.57:3128 FC1Y4Dg-T9o --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--proxy', 'http://188.166.168.57:3128', 'FC1Y4Dg-T9o', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.01.14
[debug] Python version 3.5.2 - Darwin-16.3.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.1.3, ffprobe 3.1.3
[debug] Proxy map: {'http': 'http://188.166.168.57:3128', 'https': 'http://188.166.168.57:3128'}
[youtube] FC1Y4Dg-T9o: Downloading webpage
ERROR: Unable to download webpage: <urlopen error Tunnel connection failed: 400 Bad Request> (caused by URLError(OSError('Tunnel connection failed: 400 Bad Request',),))
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/extractor/common.py", line 406, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 2001, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/urllib/request.py", line 466, in open
    response = self._open(req, data)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/urllib/request.py", line 484, in _open
    '_open', req)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/urllib/request.py", line 444, in _call_chain
    result = func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/youtube_dl/utils.py", line 1047, in https_open
    req, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/urllib/request.py", line 1256, in do_open
    raise URLError(err)

---

Addition information:

I'm using proxy to escape from "Region restriction" with YouTube video, I have list tens of proxy (all tested working), use all of proxy I have, but I just receive one error: Tunnel connection failed: 400 Bad Request.

{Note: The proxy in verbose log may be dead)

[dstftw]

Most likely all your proxies are dead.

PS C:\dev\youtube-dl\master> py -3.5 .\youtube_dl\__main__.py BaW_jenozKc -v --proxy http://127.0.0.1:8118
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['BaW_jenozKc', '-v', '--proxy', 'http://127.0.0.1:8118']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2017.01.14
[debug] Git HEAD: b80e2eb
[debug] Python version 3.5.2 - Windows-10-10.0.10240-SP0
[debug] exe versions: ffmpeg N-81192-g04da20e, ffprobe N-81192-g04da20e, rtmpdump 2.4
[debug] Proxy map: {'http': 'http://127.0.0.1:8118', 'https': 'http://127.0.0.1:8118'}
[youtube] BaW_jenozKc: Downloading webpage
[youtube] BaW_jenozKc: Downloading video info webpage
[youtube] BaW_jenozKc: Extracting video information
[youtube] BaW_jenozKc: Downloading MPD manifest
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on 'https://r3---sn-vgqsrn7l.googlevideo.com/videoplayback?id=05a5bf8de9e8cca7&itag=137&source=youtube&requiressl=yes&nh=IgpwcjAzLm9yZDEyKgkxMjcuMC4wLjE&initcwndbps=2842500&ms=au&mv=m&pl=19&mn=sn-vgqsrn7l&mm=31&ratebypass=yes&mime=video/mp4&gir=yes&clen=2208750&lmt=1387961822987808&dur=9.800&upn=7JSCLa4lwMA&signature=887F0FA8207FCA135956C30F2B4EDBDB9FD97A08.9584650392B092A63629F90F370D72AE7737A893&key=dg_yt0&mt=1484408148&ip=64.113.32.29&ipbits=0&expire=1484429928&sparams=ip,ipbits,expire,id,itag,source,requiressl,nh,initcwndbps,ms,mv,pl,mn,mm,ratebypass,mime,gir,clen,lmt,dur'
[download] Destination: youtube-dl test video ''_ä↭𝕐-BaW_jenozKc.f137.mp4
[download]  11.8% of 2.11MiB at 151.02KiB/s ETA 00:12

[mh4ck]

I have the same problem, i can access every page with the proxy but get 400 bad request on youtube.