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[3.8] bpo-43882 - Mention urllib.parse changes in Whats new section. by orsenthil · Pull Request #26277 · python/cpython · GitHub

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[3.8] bpo-43882 - Mention urllib.parse changes in Whats new section. #26277

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Jun 28, 2021
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[3.8] bpo-43882 - Mention urllib.parse changes in Whats new section. #26277

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12 changes: 12 additions & 0 deletions Doc/whatsnew/3.8.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -2294,4 +2294,16 @@ for and build on the oldest version in the range.
with fixes by FX Coudert and Eli Rykoff, and backported to 3.8 by Maxime Bélanger
and Ned Deily)

Notable changes in Python 3.8.10
================================

urllib.parse
------------

The presence of newline or tab characters in parts of a URL allows for some
forms of attacks. Following the WHATWG specification that updates :rfc:`3986`,
ASCII newline ``\n``, ``\r`` and tab ``\t`` characters are stripped from the
URL by the parser in :mod:`urllib.parse` preventing such attacks. The removal
characters are controlled by a new module level variable
``urllib.parse._UNSAFE_URL_BYTES_TO_REMOVE``. (See :issue:`43882`)

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