urllib.request.urlopen hangs for multiple minutes with timeout=30 and works with timeout=1

[saschanaz]

Bug report

Bug description:

import urllib.request
urllib.request.urlopen(urllib.request.Request("https://pypi.org/pypi/MozPhab/json"), timeout=30)

Somehow this hangs, and Control+C doesn't stop it. The same URL loads instantly on Firefox and Node.js. Any help to investigate this further will be appreciated. (Could be related to #95838, except I don't have any VPN on this machine.)

Coming from https://bugzilla.mozilla.org/show_bug.cgi?id=1919884.

CPython versions tested on:

3.12

Operating systems tested on:

Windows

[ZeroIntensity]

I wasn't able to reproduce this on Linux, so this might be a system-dependent issue. Could you share some more information about your environment?

[saschanaz]

Hasn't been a problem for a while, closing.

[saschanaz]

Had this issue again. IDK what's causing this, it's Windows 11 24H2 on Lenovo Thinkstation P620. Python 3.13.1.

[sergey-miryanov]

Can't reproduce on Windows 11 24H2 with py 3.13.1:

 [2025-03-12 14:53:13] [~] [󰅒 1:12.572]
➜ python
Python 3.13.1 (tags/v3.13.1:0671451, Dec  3 2024, 19:06:28) [MSC v.1942 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import urllib.request
>>> urllib.request.urlopen(urllib.request.Request("https://pypi.org/pypi/MozPhab/json"), timeout=30)
<http.client.HTTPResponse object at 0x000002417D38B6D0>
>>> exit()

 [2025-03-12 14:59:46] [~] [󰅒 6:32.213]
➜ systeminfo | findstr /B /C:"OS Name" /B /C:"OS Version"
OS Name:                       Microsoft Windows 11 Home
OS Version:                    10.0.26100 N/A Build 26100

 [2025-03-12 14:59:49] [~] [󰅒 1.852]
➜ (Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion") | Select-Object -Property DisplayVersion

DisplayVersion
--------------
24H2

[saschanaz]

Yeah it doesn't happen every day, just sometimes, but when it happens it keeps happening.

[ZeroIntensity]

I suspect it's your network.

[saschanaz]

Nope, as I said above:

The same URL loads instantly on Firefox and Node.js.