errors.go
func (e ErrorHandlers) Get(status int) ErrorHandler {
	if eh, ok := e[status]; ok {
		return eh
	}
	if eh, ok := e[0]; ok {
		return eh
	}
	return defaultErrorHandler
}
func (e ErrorHandlers) Get(status int) ErrorHandler {
	if eh, ok := e[status]; ok {
		return eh
	}
	if eh, ok := e[0]; ok {
		return eh
	}
	return defaultErrorHandler
}
// Get a registered ErrorHandler for this status code. If
// no ErrorHandler has been registered, a default one will
// be returned.