Deno native HTTP v/s Go native HTTP

deno_native_hello_name.ts

const listener = Deno.listen({ port: 3000 });
for await(const conn of listener)
    handleNewConnection(conn);

async function handleNewConnection(conn: Deno.Conn) {
    for await(const { request, respondWith } of Deno.serveHttp(conn)) {
        const reqBody=await request.json();
        if(reqBody) {
            respondWith(new Response(JSON.stringify({ name: reqBody.name }), {
                headers: { 'content-type': 'application/json'}
            }));
        } else
            respondWith(new Response(undefined, {status: 400}));
    }
}

go_hello_name.go

package main

import (
	"encoding/json"
	"net/http"
)

type ReqBody struct {
	Name string `json:"name"`
}

func main() {
	http.HandleFunc("/", HelloServer)
	http.ListenAndServe(":3000", nil)
}

func HelloServer(w http.ResponseWriter, r *http.Request) {
	var reqBody ReqBody
	json.NewDecoder(r.Body).Decode(&reqBody)
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(reqBody)
}