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Add a note that checking for flash messages defeats HTTP cacheability #21381

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Add a note that checking for flash messages defeats HTTP cacheability #21381

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Add a note that checking for flash messages defeats HTTP cacheability
mpdude Sep 15, 2025
bdb7a42
Remove trailing whitespace
mpdude Oct 12, 2025
240fe06
session.rst aktualisieren
mpdude Oct 15, 2025
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session.rst aktualisieren
mpdude Oct 15, 2025
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7 changes: 7 additions & 0 deletions session.rst
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Expand Up @@ -265,6 +265,13 @@ It's common to use ``notice``, ``warning`` and ``error`` as the keys of the
different types of flash messages, but you can use any key that fits your
needs.

.. tip::

Accessing flash messages means that the session must be started, which
in turn will cause Symfony to mark the responses as ``private``. In general,
since flashes shall displayed only once, pages that might display flashes
cannot reasonably be cached in HTTP caches.
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as its a tip block you are adding, what about also write that one can load such statefull flash session message async, via for ex an ux live component completely decoupled from the main response that could be stateless

Configuration
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