---
title: >-
  Shipping Rates – Return backup rates for 3xx and 4xx carrier responses -
  Shopify developer changelog
description: >-
  Shopify’s developer changelog documents all changes to Shopify’s platform.
  Find the latest news and learn about new platform opportunities.
source_url:
  html: >-
    https://shopify.dev/changelog/posts/shipping-rates-return-backup-rates-for-3xx-and-4xx-carrier-responses
  md: >-
    https://shopify.dev/changelog/posts/shipping-rates-return-backup-rates-for-3xx-and-4xx-carrier-responses.md
metadata:
  effectiveApiVersion: ''
  affectedApi:
    - displayName: Admin GraphQL API
      handle: admin-graphql
    - displayName: Admin REST API
      handle: admin-rest
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: Update
    handle: update
  indicatesActionRequired: false
  createdAt: '2025-05-14T06:33:35-04:00'
  postedAt: '2025-05-22T12:00:00-04:00'
  updatedAt: '2025-05-14T09:22:26-04:00'
  effectiveAt: '2025-05-22T12:00:00-04:00'
---

May 22, 2025

# Shipping Rates – Return backup rates for 3xx and 4xx carrier responses

DateMay 22, 2025

FlagsUpdate

SurfacesAPI

Affected APIs[Admin GraphQL API](https://shopify.dev/changelog?api_type=admin-graphql)[Admin REST API](https://shopify.dev/changelog?api_type=admin-rest)

Carriers occasionally respond with HTTP 3xx redirects or 4xx client errors. Previously, this left merchants without shipping options at checkout. The rate service now extends its existing error-handling path to treat these responses as recoverable failures. This change triggers a fallback to backup rates instead of resulting in a hard failure. As a result, shoppers still see viable shipping methods, safeguarding conversion and improving overall checkout reliability.