Vue Storefront and Backend API: Ensuring Data Consistency During Zero-Downtime Migration

Frontend-Backend Interoperability

Vue Storefront utilizes a Backend-for-Frontend (BFF) pattern to normalize data from e-commerce platforms like Magento or BigCommerce. When migrating a small application to a new version of the frontend, the goal is to achieve zero downtime by routing traffic via a Load Balancer or CDN to a new environment.

Cache and Versioning Constraints

A critical uncertainty exists regarding the synchronization of the BFF layer and the CDN cache. If the new frontend version expects a modified API response structure while the existing backend or middleware cache still serves legacy data, runtime errors may occur during the phased rollout.

• Requirement for backward compatibility between API versions.
• Risk of inconsistent state management via Vuex during traffic switching.
• Potential for cache invalidation delays across distributed CDN nodes.

What is the recommended strategy for managing BFF cache invalidation to prevent data mismatches during a canary release? How can API versioning be enforced to ensure the new frontend does not break when interacting with a production backend that has not yet been updated?