🇺🇸United States @CoffeyMachine

IMO, AJAX error messaging could use a few improvements:

1. Echoing s_leu, having the option to put the xmlhttp.responseText would be immensely helpful.
2. AJAX callbacks need a way to be able to act on PHP exceptions. Consider when Guzzle returns an API error response. The go-to behavior is to throw an exception and log it to the console. AJAX callbacks need a way to translate these error responses into human-readable messages. Perhaps we should look at the ExceptionLoggingSubscriber class to see if it's feasible to add a hook or some other means of giving the module developer the ability to act on an exception thrown by another module.

Thanks for hosting, looking forward to diving in.