protected static HttpExceptionSubscriberBase::getPriority()
Specifies the priority of all listeners in this class.
The default priority is 1, which is very low. To have listeners that have a "first attempt" at handling exceptions return a higher priority.
int The event priority of this subscriber.
protected static function getPriority() { return 0; }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!EventSubscriber!HttpExceptionSubscriberBase.php/function/HttpExceptionSubscriberBase::getPriority/8.1.x