https://github.com/python/cpython/commit/a8a1871942ef35c68a186d0592de51b7b934ee65
commit: a8a1871942ef35c68a186d0592de51b7b934ee65
branch: 3.14
author: Miss Islington (bot) <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-09-03T15:58:51Z
summary:

[3.14] gh-89735: Document requirements for the *headers* argument (GH-155640) 
(GH-156899)

Both handlers look up the header name in lowercase, and the basic
one needs get_all(), so a plain dict does not work.
(cherry picked from commit 1414d2ac6f8a57ce5e0c8d3ab1fdc7075fd2d1ea)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Opus 5 (1M context) <[email protected]>

files:
M Doc/library/urllib.request.rst

diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index cfc99804d5cf4d..f1308dd568fd0c 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -1060,6 +1060,10 @@ AbstractBasicAuthHandler Objects
    authenticate for, *req* should be the (failed) :class:`Request` object, and
    *headers* should be the error headers.
 
+   *headers* must be a mapping-like object with case-insensitive lookup
+   that implements the ``get_all()`` method,
+   such as :class:`email.message.Message` or :class:`wsgiref.headers.Headers`.
+
    *host* is either an authority (e.g. ``"python.org"``) or a URL containing an
    authority component (e.g. ``"https://python.org/"``). In either case, the
    authority must not contain a userinfo component (so, ``"python.org"`` and
@@ -1101,6 +1105,9 @@ AbstractDigestAuthHandler Objects
    should be the (failed) :class:`Request` object, and *headers* should be the
    error headers.
 
+   *headers* must be a mapping-like object with case-insensitive lookup,
+   such as :class:`email.message.Message` or :class:`wsgiref.headers.Headers`.
+
 
 .. _http-digest-auth-handler:
 

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