fsspec / fsspec/filesystem_spec

github file 404 when folder has escaped symbols

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Python
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Description

A 404 error may occur when a github folder has escaped symbols, because the actual raw address is not the folder name, but partially escaped.
Example below:
url:
https ://github.com/msojocs/fiddler-everywhere-enhance/raw/master/server/file/api.getfiddler.com/c/NUNHMjIyNkpNMDg4ZjMzMjZlLTk0OWQtNDgwNi1hMTc2LTFlZGY1MWJiOWRhOA%253D%253D/v/4.6.1/p/win/latest.yml

it's folder path:
server/file/api.getfiddler.com/c/NUNHMjIyNkpNMDg4ZjMzMjZlLTk0OWQtNDgwNi1hMTc2LTFlZGY1MWJiOWRhOA%3D%3D/v/4.6.1/p/win/latest.yml

in folderpath: %3D%3D
in url: %253D%253D

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the provided GitHub URL and comparing its partially escaped path with the folder path shown in the issue. Trace the filesystem's GitHub URL/path handling to find where %3D%3D becomes %253D%253D; done means the escaped folder resolves successfully instead of returning 404, with regression coverage for this example.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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