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[HttpFoundation] Document the PRIVATE_SUBNETS string #20238

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Sep 19, 2024
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[HttpFoundation] Document the PRIVATE_SUBNETS string #20238

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10 changes: 9 additions & 1 deletion deployment/proxies.rst
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Expand Up @@ -143,9 +143,17 @@ In this case, you'll need to - *very carefully* - trust *all* proxies.
framework:
# ...
# trust *all* requests (the 'REMOTE_ADDR' string is replaced at
# run time by $_SERVER['REMOTE_ADDR'])
# runtime by $_SERVER['REMOTE_ADDR'])
trusted_proxies: '127.0.0.1,REMOTE_ADDR'

# you can also use the 'PRIVATE_SUBNETS' string, which is replaced at
# runtime by the IpUtils::PRIVATE_SUBNETS constant
# trusted_proxies: '127.0.0.1,PRIVATE_SUBNETS'

.. versionadded:: 7.2

The support for the ``'PRIVATE_SUBNETS'`` string was introduced in Symfony 7.2.

That's it! It's critical that you prevent traffic from all non-trusted sources.
If you allow outside traffic, they could "spoof" their true IP address and
other information.
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