fetch.mjs

const options = {
  keepalive: true,
};

var i = 0;

var lastSecond = 0;
function dump() {
  if (lastSecond > 0) console.log(i - lastSecond, "req/s");
  lastSecond = i;
}

setInterval(dump, 1000);
const url = "http://localhost:3000/";

while (true) {
  try {
    const array = [
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
      fetch(url, options),
    ];
    await Promise.all(array);
    i += array.length;
  } catch (e) {
    console.error(e);
  }
}