retry.md

Retry API

Allows to restart http calls according to various criteria that we will call policies. By default there is two built-in policies:

• none (do not stop retry to append). This is the default policy.
• httpcode (allow to retry or fail on some http codes).

The httpcode by default retry on codes: 307, 408, 429, 444, 500, 503, 504, 520, 521, 522, 523, 524. However you can also choose to extend the list yourself:

import * as httpie from "@myunisoft/httpie";

const policy = httpie.policies.httpcode(new Set([501]), true);

Usage example

import * as httpie from "@myunisoft/httpie";

const { data } = httpie.retry(async() => {
  return await httpie.get("https://jsonplaceholder.typicode.com/posts");
}, { factor: 1, forever: true }, httpie.policies.httpcode());

Retry options are described by the following interface:

export interface RetryOptions {
  retries?: number;
  minTimeout?: number;
  maxTimeout?: number;
  unref?: boolean;
  factor?: number;
  forever?: boolean;
  signal?: AbortSignal | null;
}

By default it will retry three times, with a minTimeout of 1_000 and a factor of 2.

Creating your own policy

A policy "callback" is described by the following interface

export type PolicyCallback = (error?: any) => boolean;

So it's pretty straightforward to create a new one. For example here this policy will throw if the error is an AbortError.

export function abort(error) {
  return error.name === "AbortError";
}