New submission from Nick <ked...@yandex.ru>:

Apparently, CookieJar.extract_cookies doesn't process cookies form local 
domains which explicitly set domain in Set-Cookie header. That means that 
headers with domain specified, like "Set-Cookie: foo=baz; Domain=localhost;", 
are ignored. As far as I can tell, this might be actually part of the standard: 
https://stackoverflow.com/questions/1134290/cookies-on-localhost-with-explicit-domain/32210291#32210291
 . However, it looks like other HTTP clients, including modern versions of both 
Chrome and Firefox do accept cookies from localhost with explicit 
domain=localhost, and this change doesn't appear to break existing software in 
any way. (simple POC to test behavior in browsers: 
https://gist.github.com/keddad/e2ce034f68b77e59077cdb1e887fa4a1). Maybe it 
would be best to also allow this behavior in Python?

----------
components: Library (Lib)
messages: 408564
nosy: keddad
priority: normal
severity: normal
status: open
title: CookieJar.extract_cookies doesn't process cookies form local domains 
when domain is explicitly set in header
type: behavior
versions: Python 3.10, Python 3.11

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46075>
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