I've always made up my own error codes, which I embed in the 200 response since I end up having to map HTTP codes to what they mean anyway, and many libraries h

I've always made up my own error codes, which I embed in the 200 response since I end up having to map HTTP codes to what they mean anyway, and many libraries have their own behavior on how to handle various HTTP codes or cannot recognize anything other 200 and other (some LUA engines, for example).