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fetch-retry

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fetch-retry

Extend any fetch library with retry functionality


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What is fetch-retry?

The fetch-retry npm package is an extension of the native fetch API that adds the ability to automatically retry a failed HTTP request. This is particularly useful for dealing with transient network issues or temporary server-side errors. It allows developers to specify the number of retries, the retry delay, and other retry policies.

What are fetch-retry's main functionalities?

Automatic retries for failed requests

This feature allows fetch requests to be automatically retried a specified number of times with a delay between each attempt. The code sample shows how to wrap the native fetch with fetch-retry to make a GET request that retries up to 3 times with a 1-second delay between retries.

fetch = require('fetch-retry')(require('node-fetch'));

fetch('https://api.example.com', {
  retries: 3,
  retryDelay: 1000
}).then(function(response) {
  return response.json();
}).then(function(json) {
  console.log(json);
}).catch(function(error) {
  console.error(error);
});

Customizable retry on function

This feature allows developers to define a custom function to determine whether a request should be retried based on the attempt number, error, and response. The code sample demonstrates a custom retryOn function that retries the request if an error occurs or if the response status code is 500 or greater.

fetch = require('fetch-retry')(require('node-fetch'));

fetch('https://api.example.com', {
  retries: 4,
  retryDelay: 1000,
  retryOn: function(attempt, error, response) {
    if (error !== null || response.status >= 500) {
      return true;
    }
    return false;
  }
}).then(function(response) {
  return response.json();
}).then(function(json) {
  console.log(json);
}).catch(function(error) {
  console.error(error);
});

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Package last updated on 17 Mar 2024

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