fetch-with-retry.js

// import fetch from 'isomorphic-unfetch';

const RETRIES = 5;

/**
 * Example:
 *   global.fetch = fetchWithRetry;
 */

function fetchWithRetry(url, options) {
  const opts = options || {};
  // only retry if the request is GET or HEAD:
  if (/(get|head)/i.test(opts.method)) {
    return doFetch(url, opts, opts.retries || RETRIES);
  }
  return fetch(url, opts);
}

function doFetch(url, options, retriesRemaining) {
  return fetch(url, options).catch(err => {
    if (err.timedout) {  // you have to figure out when you want to retry
      if (retriesRemaining) {
        return doFetch(url, options, retriesRemaining - 1);
      }
    }
    throw err;
  });
}