New in Symfony 4.1: Self-updating debug toolbar
Warning: This post is about an unsupported Symfony version. Some of this information may be out of date. Read the most recent Symfony Docs.
One of the problems of working on those applications is that Symfony's Web Debug Toolbar remains unchanged with the debug information of the first action executed when browsing the application.
In order to solve this issue, in Symfony 4.1 we've introduced a special
Symfony-Debug-Toolbar-Replace HTTP header. Set its value to
1 to tell
Symfony to replace the web debug toolbar with the new one associated with the
If you want to enable this behavior for just one response, add this to your code:
If you work on a SPA application, it's better to define an event subscriber
and listen to the
kernel.response event to add that header automatically.
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