[HTTP] Body's Promise is blocked when no body is present

[ConsoleTVs]

• Code to replicate:

import { serve } from "https://deno.land/std@v0.11.0/http/server.ts";
const s = serve("0.0.0.0:8000");

async function main() {
  for await (const req of s) {
    const body = await req.body()
    console.log('Request body:', body)
    req.respond({ body: new TextEncoder().encode("Hello World\n") });
  }
}

main();

• Send GET: http://127.0.0.1:8000/ OK

• Send POST (with some body): http://127.0.0.1:8000/ OK

• Send POST (without body): http://127.0.0.1:8000/ BLOCKS