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Dec 15, 2016
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Update events.rst #6857

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20 changes: 16 additions & 4 deletions reference/events.rst
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Expand Up @@ -241,10 +241,8 @@ and set a new ``Exception`` object, or do nothing::

.. note::

As Symfony ensures that the Response status code is set to the most
appropriate one depending on the exception, setting the status on the
response won't work. If you want to overwrite the status code (which you
should not without a good reason), set the ``X-Status-Code`` header::
If you want to overwrite the status code (which you should not without a good reason),
set the ``X-Status-Code`` header::

$response = new Response(
'Error',
Expand All @@ -254,6 +252,20 @@ and set a new ``Exception`` object, or do nothing::
)
);

This indeed will skip all checks that Symfony processes on setting response status code.
First check that Symfony does is fitting response status code.
Symfony leaves set status code as it is if it belongs to one of group:

:method:`Symfony\\Component\\HttpFoundation\\Response::isClientError`

:method:`Symfony\\Component\\HttpFoundation\\Response::isServerError`

:method:`Symfony\\Component\\HttpFoundation\\Response::isRedirect`

If status code is different then Symfony checks instance of raised Exception if it is
:class:`Symfony\\Component\\HttpKernel\\Exception\\HttpExceptionInterface` then its headers including status code are passed to response.
Otherwise status code 500 is set to response.

.. seealso::

Read more on the :ref:`kernel.exception event <component-http-kernel-kernel-exception>`.
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