denoでのHTTPサーバーのサンプル。

sample_http_echo.ts

#!/usr/bin/env deno --allow-net

import {
    listenAndServe,
    ServerRequest,
    setContentLength,
    Response
  } from "https://deno.land/x/http/server.ts";
  import { cwd, DenoError, ErrorKind, args, stat, readDir, open } from "deno";

  const serverArgs = args.slice();
  const addr = `0.0.0.0:${serverArgs[1] || 4500}`;

  listenAndServe(addr, async req =>{
    const body  = new TextDecoder().decode(await req.body());
    const headers = new Headers();
    headers.set("content-type", "application/json");
    let res : Response = {
      status : 200,
      body: new TextEncoder().encode('{"postBody":"'+body+'"}'),
      headers
    };
    setContentLength(res);

    req.respond(res);
  });

  console.log(`HTTP server listening on http://${addr}/`);