$catchAll public property
The configuration specifying a controller action which should handle all user requests. This is mainly used when the application is in maintenance mode and needs to handle all incoming requests via a single action. The configuration is an array whose first element specifies the route of the action. The rest of the array elements (key-value pairs) specify the parameters to be bound to the action. For example,
[ 'offline/notice', 'param1' => 'value1', 'param2' => 'value2', ]
Defaults to null, meaning catch-all is not used.
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