File: retry_options.idl

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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Explainer: https://github.com/explainers-by-googlers/fetch-retry.
// Note: In the final form, we might remove some of these settings if e.g. we
// ended up not having use cases for them / browser-controlled policies are
// enough. We will re-evaluate them after origin trial.
dictionary RetryOptions {
  // Required: Maximum number of retry attempts after the initial one fails.
  // A value of 0 means no retries beyond the initial attempt.
  required unsigned long maxAttempts;

  // Optional: Delay before the first retry attempt in milliseconds.
  // Defaults to browser-configured value if not specified.
  unsigned long? initialDelay;

  // Optional: Multiplier for increasing delay between retries (e.g., 2.0 for exponential backoff).
  // A factor of 1.0 means fixed delay. Defaults to browser-configured value if not specified.
  double? backoffFactor;

  // Maximum total time allowed for all retry attempts in milliseconds, measure
  // from when the first request starts. If this duration is exceeded, no further
  // retries will be made, even if maxAttempts has not been reached.
  required unsigned long maxAge;

  // Optional: Controls whether the browser should continue attempting retries
  // even after the originating document has been unloaded.
  // This requires `keepalive: true` to be set on the Request.
  // Defaults to false.
  boolean retryAfterUnload = false;

  // Optional: Specifies whether to retry when the HTTP request method is
  // non-idempotent (e.g. POST, PUT, DELETE). If this is not set while the HTTP
  // request method of the fetch is non-idempotent, no retry will be attempted.
  // Defaults to false.
  boolean retryNonIdempotent = false;

  // Optional: Specifies whether to retry when the network request is guaranteed
  // to have not reach the server yet (e.g. a connection can't be established).
  boolean retryOnlyIfServerUnreached = false;
};