python / python/cpython

Url starting with file:\\ no longer works in urllib since 3.14

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#156,325 2 comments 0 reactions 1 assignee View on GitHub

@serhiy-storchaka is already working on this.

Since Aug 25, 2026.

stdlib type-bug
Dominant language
Python
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Description

Bug report

Bug description:
from urllib.request import urlopen
with urlopen("file:\\C:/temp/test.txt") as response:
    print(response.read())

That works in python 313 but fails in 314

Just checking if it's intended change? This resulted failure when upgrading 313->314

Same url works in webbrowser, Firefox, Edge, in Windows 11

CPython versions tested on:

3.14

Operating systems tested on:

Windows

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