Deno content server by reading files directly

deno_content_server_direct.ts

import { readableStreamFromReader as toStream } from "https://deno.land/std/streams/mod.ts";
import { serve } from "https://deno.land/std/http/mod.ts";

const BASE_PATH = "./testdata";

const reqHandler = async (req: Request) => {
  const p = new URL(req.url).pathname;
  const filePath = BASE_PATH + p;
  let len = 0;
  try {
    len = (await Deno.stat(filePath)).size;
  } catch (err) {
    return new Response(null, { status: 404 });
  }
  return new Response(toStream(await Deno.open(filePath)), {
    headers: {
      "content-length": `${len}`,
    },
  });
};

serve(reqHandler, { port: 8000 });