Unable to download videos from the website Bilibili

[pengguodong12]

youtube-dl.exe -F https://www.bilibili.com/video/av86917375 --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-F', 'https://www.bilibili.com/video/av86917375', '--verbose']
[debug] Encodings: locale cp936, fs mbcs, out cp936, pref cp936
[debug] youtube-dl version 2021.03.03
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg 4.2.3
[debug] Proxy map: {}
[BiliBili] 86917375: Downloading webpage
[BiliBili] 86917375: Downloading video info page
WARNING: Unable to download JSON metadata: HTTP Error 412: Precondition Failed
[BiliBili] 86917375: Downloading video info page
ERROR: Unable to download JSON metadata: HTTP Error 412: Precondition Failed (caused by HTTPError()); 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 "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik_\build\youtube_dl\extractor\common.py", line 632, in request_webpage
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpvjygsik\build\youtube_dl\YoutubeDL.py", line 2275, in urlopen
File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
File "C:\Python\Python34\lib\urllib\request.py", line 508, in error
File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
File "C:\Python\Python34\lib\urllib\request.py", line 588, in http_error_default

[Jane42070]

I get the same issue on Artix Linux while tryring to download Bilibili videos

[Dioxaz]

For info, logging in (with -u username) doesn't make any difference. My last successful download was on March 1st.

[xinyazhang]

It seems the standard header 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' (at utils.py:1673) prevents the server from replying something useful.

Temporary workaround: add --add-header 'Accept:*/*' to the command line.
Fix: add the missing single quote

[Dioxaz]

It seems the standard header 'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' (at utils.py:1673) prevents the server from replying something useful.

Temporary workaround: add --add-header 'Accept:*/* to the command line.

Thank you very much for this workaround. But for some reason, it doesn't seem to work in my case. I still have the exact same 412 error, logged in or not. I might be doing something wrong. Also, there seems to be a typo in your text (is the single single-quote normal?).

Edit: What worked in my case is --add-header Accept:'*/*', written exactly as I've just quoted it.

[TeachCourse]

resolved add :

--add-header Accept:'/'

[WhoR3born]

https://www.bilibili.com/video/BV1XY4114753 ?from=search&seid=9349536755186620436&spm_id_from=333.337.0.0

use bold part of link and add --add-header 'Accept:*/*'