API Gateways in a Microservices World
You'll learn to
- -Explain the gateway's role once you have many services
The Protecting Your System module introduced the API Gateway as a good idea even for a single service. In a microservices world, it goes from "good idea" to close to mandatory: dozens of independently-deployed services can't each reimplement authentication, rate limiting, and TLS termination without massive duplicated effort and inconsistency.
Backend for Frontend (BFF)
Some architectures go a step further and run multiple gateways, each tailored to one type of client: a mobile BFF that aggregates and trims responses for a bandwidth-constrained app, and a separate web BFF shaped around what the browser client needs. Same backend services underneath, different front doors for different consumers.
Each BFF aggregates the same backend services into a shape tailored to its specific client.
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Level 18: Ride-Sharing (Uber) is a full microservices exercise.