[New-bugs-announce] [issue39057] Issues with urllib.request.proxy_bypass_environment

Serhiy Storchaka report at bugs.python.org
Sun Dec 15 14:45:57 EST 2019

New submission from Serhiy Storchaka <storchaka+cpython at gmail.com>:

There are several issues with urllib.request.proxy_bypass_environment:

1. Leading dots are ignored in the proxy list, but not in the checked hostname. So ".localhost" does not matches ".localhost" in the proxy list.

2. A single trailing \n in the checked hostname is ignored, so "localhost\n" passes the check if the proxy list contains "localhost". But "localhost\n\n" and "localhost " do not pass. This is an artifact of using $ in the regular expression.

components: Library (Lib)
messages: 358444
nosy: orsenthil, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Issues with urllib.request.proxy_bypass_environment
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9

Python tracker <report at bugs.python.org>

More information about the New-bugs-announce mailing list