Promise.allSettled hangs with a large number of promises, what should I do?

Question

JavaScript

Good afternoon.

There is a certain code that receives data through the API of a third-party service. But after several executions, there are hangups when receiving data, respectively, falls off by timeout.

If you manually follow the link on which it hangs, then everything works out properly.
It also works properly on a small number of requests, but as the number goes over about 300-400, then sometimes freezes begin.

How to get rid of freezes and get full data?

let result = await Promise.allSettled(promises);
  return result
    .filter((p) => {
      console.log(p);
      return p.status === 'fulfilled' && p.value.stringencyData !== undefined;
    })
    .map((e) => {
      const { stringencyData } = e.value;
      return {
        dateValue: stringencyData.date_value,
        countryCode: stringencyData.country_code,
        stringencyActual: stringencyData.stringency_actual,
        ...stringencyData,
      };
    });

The promises variable is filled in like this:

async function getData(alpha, date) {
  let res, json;
  try {
    res = await fetch(`https://covidtrackerapi.bsg.ox.ac.uk/api/v2/stringency/actions/${alpha}/${date}`, {
      timeout: 200000,
    });
  } catch (err) {
    console.log(err);
  }

  try {
    json = await res.json();
  } catch (err) {
    console.log(err);
  }

  return json;
}

Answer 1

_{let it be}

this is the restriction of requests from the server side (anti ddos).
https://qna.habr.com/q/1105356 here is the way.