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Flow action extensions now support relative paths for endpoint URLs

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Shopify·2 months ago · Jun 18, 2026, 04:00 PMFeatureAI-assisted summary

Summary

Added support for relative paths in Flow action extension endpoint URLs (runtime_url, validation_url, config_page_url, config_page_preview_url).
Shopify CLI now resolves relative paths against the development tunnel URL during dev and against the app's application_url after deployment, eliminating manual URL updates.
Absolute HTTPS URLs remain required for external services; protocol‑relative URLs are unsupported and an HTTPS application_url is required before deployment.

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