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SESSION_COOKIE_DOMAIN caveat documentation #5464

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May 25, 2024
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SESSION_COOKIE_DOMAIN caveat documentation #5464

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6 changes: 6 additions & 0 deletions docs/config.rst
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Expand Up @@ -142,6 +142,12 @@ The following configuration values are used internally by Flask:

Default: ``None``

.. warning::
If this is changed after the browser created a cookie is created with
one setting, it may result in another being created. Browsers may send
send both in an undefined order. In that case, you may want to change
:data:`SESSION_COOKIE_NAME` as well or otherwise invalidate old sessions.

.. versionchanged:: 2.3
Not set by default, does not fall back to ``SERVER_NAME``.

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