[Python-checkins] Add note that headers added via urllib.request.add_header are added to redirected requests (#30708)

[orsenthil]

https://github.com/python/cpython/commit/f348154c8f8a9c254503306c59d6779d4d09b3a9
commit: f348154c8f8a9c254503306c59d6779d4d09b3a9
branch: main
author: Ashwin Ramaswami <aramaswamis at gmail.com>
committer: orsenthil <senthilx at amazon.com>
date: 2022-04-27T16:25:03-06:00
summary:

Add note that headers added via urllib.request.add_header are added to redirected requests (#30708)

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

diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
index a8501ab863968..3823981b37c40 100644
--- a/Doc/library/urllib.request.rst
+++ b/Doc/library/urllib.request.rst
@@ -547,7 +547,8 @@ request.
    name, and later calls will overwrite previous calls in case the *key* collides.
    Currently, this is no loss of HTTP functionality, since all headers which have
    meaning when used more than once have a (header-specific) way of gaining the
-   same functionality using only one header.
+   same functionality using only one header.  Note that headers added using
+   this method are also added to redirected requests.
 
 
 .. method:: Request.add_unredirected_header(key, header)