class ServiceUnavailableException
extends HttpException
import { ServiceUnavailableException } from "https://deno.land/x/abc@v1.3.1/http_exception.ts";
x/abc/http_exception.ts>ServiceUnavailableException
import { ServiceUnavailableException } from "https://deno.land/x/abc@v1.3.1/http_exception.ts";