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Add note on connection timeout being larger than specified. Fix #5773 #6600

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Dec 16, 2023
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Add note on connection timeout being larger than specified. Fix #5773 #6600

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a64f32b
Add note on connection timeout being larger than specified. Fix #5773
MestreLion Dec 13, 2023
951dd15
Update docs/user/advanced.rst
sigmavirus24 Dec 16, 2023
92f9e43
Update docs/user/advanced.rst
sigmavirus24 Dec 16, 2023
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14 changes: 14 additions & 0 deletions docs/user/advanced.rst
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Expand Up @@ -1122,4 +1122,18 @@ coffee.

r = requests.get('https://github.com', timeout=None)

.. note:: The connect timeout applies to each connection attempt to an IP address.
If multiple addresses exist for a domain name, the underlying ``urllib3`` will
try each address sequentially until one successfully connects.
This may lead to an effective total connection timeout *multiple* times longer
than the specified time, e.g. an unresponsive server having both IPv4 and IPv6
addresses will have its perceived timeout *doubled*, so take that into account
when setting the connection timeout.
.. note:: Neither the connect nor read timeouts are `wall clock`_. This means
that if you start a request, and look at the time, and then look at
the time when the request finishes or times out, the real-world time
may be greater than what you specified.

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.. _`wall clock`: https://wiki.php.net/rfc/max_execution_wall_time
.. _`connect()`: https://linux.die.net/man/2/connect
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