// the way i currently do
import { writeAll } from "https://deno.land/[email protected]/streams/mod.ts";

const encoder = new TextEncoder();
const ok = (body: string) => {
  const { byteLength } = encoder.encode(body);
  const text = [
    "HTTP/1.1 103 Early Hints",
    "Link: </style.css>; rel=preload",
    "Link: </script.js>; rel=preload",
    "",
    "",
    "HTTP/1.1 200 OK",
    "Content-Type: text/plain",
    `Content-Length: ${byteLength}`,
    "",
    body,
    "",
  ].map((str) => `${str}\r\n`).join("");
  return encoder.encode(text);
};

const handler = (async (req: Request) => {
  const [conn, _firstPacket] = Deno.upgradeHttpRaw(req);

  const res = ok("hello");
  await writeAll(conn, res);

  conn.close();
}) as unknown as Deno.ServeHandler;

Deno.serve(handler);

Deno.serve((req, ctx) => {
  ctx.respondInformationalResponse(
    new Response(null, {
      status: 103,
      headers: {...},
    }),
  );
  return new Response("hello");
});