module ActionController::Rescue

def process_action(*)
  super
rescue Exception => exception
  request.env["action_dispatch.show_detailed_exceptions"] ||= show_detailed_exceptions?
  rescue_with_handler(exception) || raise
end

exception pages.
`request.local?` so local requests in production still show the detailed
`false`. By default, it returns `false`, but someone may set it to
shown. This method is only called when `consider_all_requests_local` is
Override this method if you want to customize when detailed exceptions must be

def show_detailed_exceptions?
  false
end