Fix: use the response handler

[stramel]

Changes

Utilizes the responseHandler variable which will properly check if config.expirements.app is set before calling the requestHandler.

Fixes the bug found in #1514

Testing

Manually tested

Docs

Bug fix only

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[dargue3]

I surfaced this bug in discussion #1514 and I made these changes locally to my node_modules and can confirm that this is perfect for my auth middleware use case!

[FredKSchott]

Great, thanks @stramel!