Use serveTls instead.

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

If the port is omitted from the ListenOptions, port 443 is used.

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

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

const port = 4505;
const certFile = "/path/to/certFile.crt";
const keyFile = "/path/to/keyFile.key";

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

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

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