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Version: 6.x

Class: RetryAgent

Extends: undici.Dispatcher

A undici.Dispatcher that allows to automatically retry a request. Wraps a undici.RetryHandler.

new RetryAgent(dispatcher, [options])​

Arguments:

  • dispatcher undici.Dispatcher (required) - the dispatcher to wrap
  • options RetryHandlerOptions (optional) - the options

Returns: ProxyAgent

Parameter: RetryHandlerOptions​

  • retry (err: Error, context: RetryContext, callback: (err?: Error | null) => void) => void (optional) - Function to be called after every retry. It should pass error if no more retries should be performed.
  • maxRetries number (optional) - Maximum number of retries. Default: 5
  • maxTimeout number (optional) - Maximum number of milliseconds to wait before retrying. Default: 30000 (30 seconds)
  • minTimeout number (optional) - Minimum number of milliseconds to wait before retrying. Default: 500 (half a second)
  • timeoutFactor number (optional) - Factor to multiply the timeout by for each retry attempt. Default: 2
  • retryAfter boolean (optional) - It enables automatic retry after the Retry-After header is received. Default: true
  • methods string[] (optional) - Array of HTTP methods to retry. Default: ['GET', 'PUT', 'HEAD', 'OPTIONS', 'DELETE']
  • statusCodes number[] (optional) - Array of HTTP status codes to retry. Default: [429, 500, 502, 503, 504]
  • errorCodes string[] (optional) - Array of Error codes to retry. Default: ['ECONNRESET', 'ECONNREFUSED', 'ENOTFOUND', 'ENETDOWN','ENETUNREACH', 'EHOSTDOWN', 'UND_ERR_SOCKET']

RetryContext

  • state: RetryState - Current retry state. It can be mutated.
  • opts: Dispatch.DispatchOptions & RetryOptions - Options passed to the retry handler.

Example:

import { Agent, RetryAgent } from 'undici'

const agent = new RetryAgent(new Agent())

const res = await agent.request('http://example.com')
console.log(res.statuCode)
console.log(await res.body.text())