Use serve instead.

Constructs a server, creates a listener on the given address, accepts incoming connections, and handles requests on these connections with the given handler.

If the port is omitted from the ListenOptions, 80 is used.

If the host is omitted from the ListenOptions, the non-routable meta-address 0.0.0.0 is used.

import { listenAndServe } from "https://deno.land/std@0.224.0/http/server.ts";

const port = 4505;

console.log("server listening on http://localhost:4505");

await listenAndServe({ port }, (request) => {
const body = `Your user-agent is:\n\n${request.headers.get(
"user-agent",
) ?? "Unknown"}`;

return new Response(body, { status: 200 });
});