Commit #b5ce9e5 introduced a regression which disallows the ability to call the same handler/action defined as the `onInvalidEvent` or `invalidEventHandler`
This param of:
Means that you no longer have the ability to call the invalid event handler as a 404 response, if that 404 is defined as the invalid event. As such, a new method must be created with the same code and all 404 responses directed to it, or the following code is triggered:
Suggest re-param-ing `request._lastInvalidEvent` to an empty string
I believe this is fixed now.