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WDT following AJAX requests#9692

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jeffreymb wants to merge3 commits intosymfony:masterfromjeffreymb:wdt_follow_ajax
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1 change: 1 addition & 0 deletionsprofiler.rst
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Expand Up@@ -21,3 +21,4 @@ install the profiler before using it:
profiler/profiling_data
profiler/matchers
profiler/storage
profiler/wdt_follow_ajax
40 changes: 40 additions & 0 deletionsprofiler/wdt_follow_ajax.rst
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.. index::
single: Profiling: WDT Auto-update after AJAX Request

How to Make the Web Debug Toolbar Auto-update After AJAX Requests
================================================================

For single page applications it would be more convenient if the toolbar
showed the information for the most recent AJAX request instead of the
initial page load.

By setting the ``Symfony-Debug-Toolbar-Replace`` header to a value of ``1`` in the
AJAX request, the toolbar will be automatically reloaded for the request. The
header can be set on the response object::

$response->headers->set('Symfony-Debug-Toolbar-Replace', 1);

Only Setting the Header During Development
-------------------------------------------

Ideally this header should only be set during development and not for
production. This can be accomplished by setting the header in a
:ref:`kernel.response <component-http-kernel-kernel-response>` event listener::

public function onKernelResponse(FilterResponseEvent $event)
{
$response = $event->getResponse();

$response->headers->set('Symfony-Debug-Toolbar-Replace', 1);
}

.. seealso::

Read more Symfony events :ref:`/reference/events`.

If you are using Symfony Flex, you should define your event listener service in the
``config/services_dev.yml`` file so that it only exists in the ``dev`` environment.

.. seealso::

Read more on creating dev only services :ref:`/configuration/configuration_organization`.
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