User impersonation is a popular Symfony security feature that allows you to browse the application as if you were another user, for instance when you are debugging or trying to understand a bug a user sees that you can't reproduce. In Symfony 3.4 we improved this feature a bit to make it easier to debug.
The well known security log message "User was reloaded from a user provider."
includes the user provider and the username of the impersonated user in its
context. In Symfony 3.4, to make things easier to debug, this context will also
include the username of the impersonator user via the
In Symfony 3.4, the security panel of the Web Debug Toolbar will include more details when using impersonation. First, it will also show the username of the impersonator user. Second, it will include a link to exit from the impersonation:
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