Deno native HTTP v/s Spring Boot HTTP

DemoApplication.java

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.http.ResponseEntity;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @PostMapping("/")
    public ReqName handleRequest(@RequestBody ReqName rBody) {
        return rBody;
    }
}

class ReqName{
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
     }
}

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}));
    }
}