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[3.6] bpo-43882 - Mention urllib.parse changes in Whats New section for 3.6.14 by orsenthil · Pull Request #26268 · python/cpython · GitHub

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[3.6] bpo-43882 - Mention urllib.parse changes in Whats New section for 3.6.14 #26268

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Merged
ned-deily merged 3 commits into from
May 20, 2021
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[3.6] bpo-43882 - Mention urllib.parse changes in Whats New section for 3.6.14 #26268

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[3.6] bpo-43882 - Mention urllib.parse changes in Whats New section f…
orsenthil May 20, 2021
6c022f6
minor formatting and wording fixup.
gpshead May 20, 2021
f5f2e72
apply the same formatting as 3.7.
gpshead May 20, 2021
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7 changes: 7 additions & 0 deletions Doc/whatsnew/3.6.rst
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Expand Up @@ -2481,3 +2481,10 @@ IPv4 address sent from the remote server when setting up a passive data
channel. We reuse the ftp server IP address instead. For unusual code
requiring the old behavior, set a ``trust_server_pasv_ipv4_address``
attribute on your FTP instance to ``True``. (See :issue:`43285`)

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 :func:`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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