Deno 1.14(deno.com)

   const server = Deno.listen({ port: 8080 });
   console.log(`HTTP webserver running.  Access it at:  http://localhost:8080/`);

    // Connections to the server will be yielded up as an async iterable.
    for await (const conn of server) {
     // In order to not be blocking, we need to handle each connection individually
     // without awaiting the 
    function
  serveHttp(conn);

     async function serveHttp(conn: Deno.Conn) {
      // This "upgrades" a network connection into an HTTP connection.
      const httpConn = Deno.serveHttp(conn);
      // Each request sent over the HTTP connection will be yielded as an async
      // iterator from the HTTP connection.
      for await (const requestEvent of httpConn) {
       // The native HTTP server uses the web standard `Request` and `Response`
       // objects.
    const body = `Your user-agent is:\n\n${requestEvent.request.headers.get(
      "user-agent",
    ) ?? "Unknown"}`;
    // The requestEvent's `.respondWith()` method is how we send the response
    // back to the client.
    requestEvent.respondWith(
      new Response(body, {
        status: 200,
      }),
    );
  }

    import { serve } from "https://deno.land/[email protected]/http/server.ts";