The --proxy instruction uses methods to describe errors

[821938089]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.06.25. 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 Issues with outdated version will be rejected.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 2017.06.25

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

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 --verbose https://www.youtube.com/watch?v=-qFW9lAA7nM --proxy "socks5://127.0.0.1:1080/"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.youtube.com/watch?v=-qFW9lAA7nM', u'--proxy', u'socks5://127.0.0.1:1080/']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.06.25
[debug] Python version 2.7.13 - Linux-4.10.0-24-generic-i686-with-Ubuntu-17.04-zesty
[debug] exe versions: ffmpeg 3.2.4-1build2, ffprobe 3.2.4-1build2, rtmpdump 2.4
[debug] Proxy map: {u'http': u'socks5://127.0.0.1:1080/', u'https': u'socks5://127.0.0.1:1080/'}
[youtube] -qFW9lAA7nM: Downloading webpage
ERROR: Unable to download webpage: IncompleteRead(7276 bytes read, 916 more expected) (caused by IncompleteRead(7276 bytes read, 916 more expected)); 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.
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 502, in _request_webpage
    return self._downloader.urlopen(url_or_request)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2137, 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/local/bin/youtube-dl/youtube_dl/utils.py", line 974, in http_response
    content = resp.read()
  File "/usr/lib/python2.7/socket.py", line 355, in read
    data = self._sock.recv(rbufsize)
  File "/usr/lib/python2.7/httplib.py", line 573, in read
    return self._read_chunked(amt)
  File "/usr/lib/python2.7/httplib.py", line 633, in _read_chunked
    value.append(self._safe_read(amt))
  File "/usr/lib/python2.7/httplib.py", line 690, in _safe_read
    raise IncompleteRead(''.join(s), amt)

And

$ youtube-dl --verbose https://www.youtube.com/watch?v=-qFW9lAA7nM --proxy "socks5://127.0.0.1:1080"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'https://www.youtube.com/watch?v=-qFW9lAA7nM', u'--proxy', u'socks5://127.0.0.1:1080']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.06.25
[debug] Python version 2.7.13 - Linux-4.10.0-24-generic-i686-with-Ubuntu-17.04-zesty
[debug] exe versions: ffmpeg 3.2.4-1build2, ffprobe 3.2.4-1build2, rtmpdump 2.4
[debug] Proxy map: {u'http': u'socks5://127.0.0.1:1080', u'https': u'socks5://127.0.0.1:1080'}
[youtube] -qFW9lAA7nM: Downloading webpage
[youtube] -qFW9lAA7nM: Downloading video info webpage
WARNING: unable to download video info webpage: IncompleteRead(201 bytes read)
WARNING: unable to download video info webpage: IncompleteRead(1224 bytes read, 13 more expected)
[youtube] -qFW9lAA7nM: Extracting video information
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[debug] Invoking downloader on u'https://r3---sn-i3b7kn7d.googlevideo.com/videoplayback?ei=HOhSWdalJYGq4gL3uL2QDw&pl=24&gir=yes&clen=436418506&expire=1498627196&mt=1498605181&mm=31&mn=sn-i3b7kn7d&dur=1258.190&id=o-AHYcauT17_4pCHDpEogjrZvWXSE1b271B221k5A5218S&source=youtube&mv=u&ms=au&key=yt6&ip=47.52.101.243&lmt=1498530844812198&itag=137&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&ipbits=0&requiressl=yes&keepalive=yes&signature=CFB1B198E0EFB61F4BA0FB2FA74E1E698DEF918F.4C13BEEC4345BEE74A686CDE376F16D1DADCACF0&mime=video%2Fmp4&ratebypass=yes'
[download] Destination: SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f137.mp4
[download] 100% of 416.20MiB in 05:46
[debug] Invoking downloader on u'https://r3---sn-i3b7kn7d.googlevideo.com/videoplayback?ei=HOhSWdalJYGq4gL3uL2QDw&pl=24&gir=yes&clen=16550113&expire=1498627196&mt=1498605181&mm=31&mn=sn-i3b7kn7d&dur=1258.201&id=o-AHYcauT17_4pCHDpEogjrZvWXSE1b271B221k5A5218S&source=youtube&mv=u&ms=au&key=yt6&ip=47.52.101.243&lmt=1498391247442799&itag=251&sparams=clen%2Cdur%2Cei%2Cgir%2Cid%2Cip%2Cipbits%2Citag%2Ckeepalive%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Crequiressl%2Csource%2Cexpire&ipbits=0&requiressl=yes&keepalive=yes&signature=9E6933EF8FAE98822D4102414961FF631C2697BA.966118D4AA41AB33D434A53AB4F010F8653487D7&mime=audio%2Fwebm&ratebypass=yes'
[download] Destination: SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f251.webm
[download] 100% of 15.78MiB in 00:15
[ffmpeg] Merging formats into "SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.mkv"
[debug] ffmpeg command line: ffmpeg -y -i 'file:SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f137.mp4' -i 'file:SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f251.webm' -c copy -map '0:v:0' -map '1:a:0' 'file:SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.temp.mkv'
Deleting original file SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f137.mp4 (pass -k to keep)
Deleting original file SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f251.webm (pass -k to keep)

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Description of your issue, suggested solution and other information

I use --proxy "socks5://127.0.0.1:1080/" ,it will report a error ,Details can see the above debug.
This question toss my half a day.
Ultimately, I found that the original is "/" the problem.
$ youtube-dl --verbose https://www.youtube.com/watch?v=-qFW9lAA7nM --proxy "socks5://127.0.0.1:1080"
$ youtube-dl --verbose https://www.youtube.com/watch?v=-qFW9lAA7nM --proxy "socks5://127.0.0.1:1080/"

[dstftw]

> py -3.6 .\youtube_dl\__main__.py --proxy 'socks4://127.0.0.1:9050/' -- '-qFW9lAA7nM'
[youtube] -qFW9lAA7nM: Downloading webpage
[youtube] -qFW9lAA7nM: Downloading video info webpage
[youtube] -qFW9lAA7nM: Extracting video information
[youtube] -qFW9lAA7nM: Downloading MPD manifest
WARNING: [youtube] -qFW9lAA7nM: Skipping DASH manifest: ExtractorError("Failed to download MPD manifest: <urlopen error [Errno 91] request rejected or failed> (caused by URLError(Socks4Error(91, 'request rejected or failed'),))",)
WARNING: Requested formats are incompatible for merge and will be merged into mkv.
[download] Destination: SciCraft 31 - Quarry Progress Monitoring--qFW9lAA7nM.f137.mp4
[download]   0.2% of 416.20MiB at 648.38KiB/s ETA 10:55
ERROR: Interrupted by user