---
title: >-
  Flow action extensions now support relative paths for endpoint URLs - Shopify
  developer changelog
description: >-
  Shopify’s developer changelog documents all changes to Shopify’s platform.
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source_url:
  html: >-
    https://shopify.dev/changelog/flow-action-extensions-now-support-relative-paths-for-endpoint-urls
  md: >-
    https://shopify.dev/changelog/flow-action-extensions-now-support-relative-paths-for-endpoint-urls.md
metadata:
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  affectedApi: []
  primaryTag:
    displayName: Tools
    handle: tools
  secondaryTag:
    displayName: Update
    handle: update
  indicatesActionRequired: false
  createdAt: '2026-06-17T10:01:51-04:00'
  postedAt: '2026-06-18T12:00:00-04:00'
  updatedAt: '2026-06-17T13:12:20-04:00'
  effectiveAt: '2026-06-18T12:00:00-04:00'
---

June 18, 2026

Tags:

* Tools

# Flow action extensions now support relative paths for endpoint URLs

You can now use relative paths for endpoint URLs in your Flow action [extension configuration](https://shopify.dev/docs/apps/build/flow/actions/reference#toml). The `runtime_url`, `validation_url`, `config_page_url`, and `config_page_preview_url` properties accept either an absolute HTTPS URL, such as `https://example.com/api/flow/actions/place-bid`, or a relative path that starts with a single `/`, such as `/api/flow/actions/place-bid`.

When you use a relative path, Shopify CLI resolves it against your development tunnel URL while `shopify app dev` is running, and against your app’s `application_url` after you deploy. This means you no longer need to update your `runtime_url` each time your development tunnel URL changes, making it easier to point Flow actions at routes hosted by your own app.

Use an absolute HTTPS URL when your endpoint is hosted on a different domain or service than your app, or when you want Flow to call the same URL in every environment. Protocol-relative URLs (such as `//example.com/api/execute`) aren’t supported, and your app configuration must include an HTTPS `application_url` before you deploy with relative paths.

For more details, see the Flow action [configuration reference](https://shopify.dev/docs/apps/build/flow/actions/reference) and [Create a Flow action](https://shopify.dev/docs/apps/build/flow/actions/create).