System Design Patterns: From Fundamentals to Real Systems
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API Gateway

1. The Incident

The store's backend now contains eleven services, including catalog, search, checkout, orders, accounts, and reviews, while web, iOS, and Android clients call each one directly. These eleven separate public entrances become expensive together.

Authentication exists eleven times. Every service validates tokens through whichever library version it last deployed, and an audit finds three implementations in two languages. The reviews-service version is fourteen months old and ignores token revocation, which cancels a token before normal expiry

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