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Docs: clarify Session safety in multi-process environments #7135

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10 changes: 10 additions & 0 deletions docs/user/advanced.rst
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Expand Up @@ -17,6 +17,16 @@ you're making several requests to the same host, the underlying TCP
connection will be reused, which can result in a significant performance
increase (see `HTTP persistent connection`_).

.. warning::

``requests.Session`` objects are **not safe to share across multiple processes**.
In a multi-process environment (for example, when using ``multiprocessing`` or
task queues like Celery), create a **separate Session in each process**.

Sharing a Session across processes may lead to unexpected behavior due to
connection pooling being inherited after a process fork.


A Session object has all the methods of the main Requests API.

Let's persist some cookies across requests::
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