fetch-retry-typescript-async.ts

import fetch from 'node-fetch';

const https = require('https');
const httpsAgent = new https.Agent({
  keepAlive: true,
});

export const fetch_retry = async (
  url: string,
  options: any = null,
  useHttpKeepAlive: boolean = true,
  retryCount: number = 2,
) => {
  try {
    // options are optional, let's default to a GET if not provided
    if (!options) {
      options = { method: 'GET' };
    }

    // http keep alive allows us to re-use connections for faster calls, use it if we can
    if (useHttpKeepAlive && !options.agent) {
      options.agent = httpsAgent;
    }

    // run the fetch like normal
    return await fetch(url, options);
  } catch (err) {
    // an error occurred with the fetch.  Could be a normal error, could be a keep alive
    console.log('An error occurred with fetch: ', err);

    // if we are down to our last retry count, just throw the error and don't try again
    if (retryCount === 1) throw err;

    console.log(`Attempting to retry fetch. RetryCount: ${retryCount}`);
    // recursively call this function again, decrementing the retryCount
    // do a fresh https agent without keep alive to increase chance of getting it returned
    return await fetch_retry(url, options, false, retryCount - 1);
  }
};

// example usage
/*
import { fetch_retry } from "./fetch-retry-helper";

export class YourService {
  async GetDataFromAnApi(url: string): Promise<any> {
    const response = await fetch_retry(url);
    return response.json();
  }
}
*/