Replying to myself - this is what I found.
The presentation that I saw that said that putting error400.ctp in a json
folder under /app/View/Errors would work automatically seems to be
incorrect.
The solution I came up with included the following steps:
1. Set a flag in app/Controller/AppControl
I am developing a REST API using the latest CakePHP. I was under the
impression (from a presentation I watched on YouTube from CakeFest 2010)
that I could throw an error and have it return the error as JSON to the
client by adding a json direction below /app/View/Errors and adding the
appropri