@Override
    public String toString() {
        return MoreObjects.toStringHelper(this).omitNullValues()
                          .add("route", route())
                          .add("service", service())
                          .add("decorator", decorator())
                          .toString();
    }
Builds a safe decorated {@link HttpService} by wrapping the localDecorator with
exceptionHandlingDecorators.

@param localDecorator a decorator to decorate the service with.
core/src/main/java/com/linecorp/armeria/internal/server/annotation/AnnotatedServiceElement.java